If F(x) = 2x-5x^2 And G(x) = 5x+2, What Is F(4)? | Free Math Help Forum
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- Start date Mar 13, 2018
ilovemath10
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Joined Mar 13, 2018 Messages 8 If f(x) = 2x-5x^2 and g(x) = 5x+2, what is f(4)? Possible answers include -2376, -1584, -362, -50, or none of these. Last edited by a moderator: Mar 14, 2018 DDeleted member 4993
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ilovemath10 said: Possible answers include -2376, -1584, -362, -50, or none of these. Click to expand...[h=2]If f(x) = 2x-5x^2 and g(x) = 5x+2, what is f(4)?What are your thoughts?[/h] Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll start with the definitions. You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL: http://www.freemathhelp.com/forum/announcement.php?f=33 I
ilovemath10
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Joined Mar 13, 2018 Messages 8Subhotosh Khan said: [h=2]If f(x) = 2x-5x^2 and g(x) = 5x+2, what is f(4)?What are your thoughts?[/h] Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll start with the definitions. You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL: http://www.freemathhelp.com/forum/announcement.php?f=33 Click to expand...I need to know the answer now out of necessity, but would like to learn how to do that type of problem.
Dr.Peterson
Elite Member
Joined Nov 12, 2017 Messages 16,903ilovemath10 said: If f(x) = 2x-5x^2 and g(x) = 5x+2, what is f(4)? Possible answers include -2376, -1584, -362, -50, or none of these. Click to expand...If you are unfamiliar with the notation involved here, you can read about it here. After doing that (or checking your textbook), please write back and show what you have tried, so we can see what help you need. I have to say that the choices offered are not what I would expect (the right answer, and several natural mistakes a student could make). I
ilovemath10
New member
Joined Mar 13, 2018 Messages 8Dr.Peterson said: If you are unfamiliar with the notation involved here, you can read about it here. After doing that (or checking your textbook), please write back and show what you have tried, so we can see what help you need. I have to say that the choices offered are not what I would expect (the right answer, and several natural mistakes a student could make). Click to expand...My trouble is what to do with the problem. I plug in 4 for x in both equations, and end up with -72 on the one with f, and 22 for g. Now what? I don't understand what I'm supposed to do now. I
ilovemath10
New member
Joined Mar 13, 2018 Messages 8Dr.Peterson said: If you are unfamiliar with the notation involved here, you can read about it here. After doing that (or checking your textbook), please write back and show what you have tried, so we can see what help you need. I have to say that the choices offered are not what I would expect (the right answer, and several natural mistakes a student could make). Click to expand...I begin by plugging in 4 for x in the first equation, and end up with -72. If I remember these kinds of problems correctly, aren't you supposed to plug in your answer from the first equation into the second equation or something? D
Deleted member 4993
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ilovemath10 said: If f(x) = 2x-5x^2 and g(x) = 5x+2, what is f(4)? Possible answers include -2376, -1584, -362, -50, or none of these. Click to expand...Are you sure that you have posted the given problem completely and accurately? Please confirm. I
ilovemath10
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Joined Mar 13, 2018 Messages 8Subhotosh Khan said: Are you sure that you have posted the given problem completely and accurately? Please confirm. Click to expand...Yes, it is in it's complete and legitimate form. Can someone solve it?
Dr.Peterson
Elite Member
Joined Nov 12, 2017 Messages 16,903ilovemath10 said: I begin by plugging in 4 for x in the first equation, and end up with -72. If I remember these kinds of problems correctly, aren't you supposed to plug in your answer from the first equation into the second equation or something? Click to expand...No, you just do what you are told to do! In this case (assuming you quoted the problem correctly), you were told only to evaluate f(4), so you can totally ignore g. That is probably there for a different problem in the same set. I, too, get f(4) = -72, so the answer is "none of these". Unless, again, you didn't copy the problem correctly. There will be other problems in which you might have to do composition of functions (which is what you are thinking of), but this is not that problem. I
ilovemath10
New member
Joined Mar 13, 2018 Messages 8Dr.Peterson said: No, you just do what you are told to do! In this case (assuming you quoted the problem correctly), you were told only to evaluate f(4), so you can totally ignore g. That is probably there for a different problem in the same set. I, too, get f(4) = -72, so the answer is "none of these". Unless, again, you didn't copy the problem correctly. There will be other problems in which you might have to do composition of functions (which is what you are thinking of), but this is not that problem. Click to expand...Thanks. Could you also teach me how to do these composition functions you speak of?
Steven G
Elite Member
Joined Dec 30, 2014 Messages 14,603ilovemath10 said: Possible answers include -2376, -1584, -362, -50, or none of these. Click to expand...Hi. Functions just like people are given names. If you were given two names of your new neighbor, epsilon and delta, and then were told something about delta, then you would not have a problem knowing that you were told something about delta. You are asked to find something about the function call f so we ignore f, We compute f(4) using the f function and get -72 Last edited: Mar 13, 2018
Steven G
Elite Member
Joined Dec 30, 2014 Messages 14,603ilovemath10 said: Thanks. Could you also teach me how to do these composition functions you speak of? Click to expand...By definition, the fog(x) = f(g(x). This is saying to first find g(x) and then find f of that result. So for example to find fog(4) you 1st find g(4) then find f of what ever g(4) happens to be. Using your formulas for f and g can you find fog(x) and fog(4)? I
ilovemath10
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Joined Mar 13, 2018 Messages 8 I'm honestly so happy I found this website. Up until now, I've been using Yahoo answers and quora for my math troubles, and you guys answered a question in 30 minutes when quora hasn't answered it in a week. You guys rock! Steven G
Elite Member
Joined Dec 30, 2014 Messages 14,603ilovemath10 said: I'm honestly so happy I found this website. Up until now, I've been using Yahoo answers and quora for my math troubles, and you guys answered a question in 30 minutes when quora hasn't answered it in a week. You guys rock! Click to expand...I'm glad that you like this site! Now please tell us what fog(x) and fog(x) equals. I
ilovemath10
New member
Joined Mar 13, 2018 Messages 8Jomo said: I'm glad that you like this site! Now please tell us what fog(x) and fog(x) equals. Click to expand...Huh? L
lookagain
Elite Member
Joined Aug 22, 2010 Messages 3,250ilovemath10 said: Thanks. Could you also teach me how to do these composition functions you speak of? Click to expand...This is not a teaching site. You are to learn that in the classroom. Tutors/helpers are to coach/reinforce what you have already gone over and have questions over and/or shown some attempts here.
Dr.Peterson
Elite Member
Joined Nov 12, 2017 Messages 16,903ilovemath10 said: Thanks. Could you also teach me how to do these composition functions you speak of? Click to expand...Here is one place to go for this kind of help. The third page in will be most directly relevant, but you should read through the whole presentation. Here is another. You must log in or register to reply here. Share: Facebook X (Twitter) Reddit Pinterest Tumblr WhatsApp Email Share Link
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