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Calcmathlete
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GIven that \(f(x) = \sqrt{9  x^2}\), and that \(g(x) = f(x  4)\), rewrite g(x) in terms of x. Please tell me how to do it and not just the answer.
 2 years ago
 2 years ago
Calcmathlete Group Title
GIven that \(f(x) = \sqrt{9  x^2}\), and that \(g(x) = f(x  4)\), rewrite g(x) in terms of x. Please tell me how to do it and not just the answer.
 2 years ago
 2 years ago

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abstracted Group TitleBest ResponseYou've already chosen the best response.2
\[g(x)=f(x4)\]Notice that\[f(x4)=\sqrt{9(x4)^2}\] Follow so far?
 2 years ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.0
dw:1344985583558:dw
 2 years ago

Calcmathlete Group TitleBest ResponseYou've already chosen the best response.0
Oh...so you plugged in f(x  4) which is formed by plugging in (x  4) for x in f(x)?
 2 years ago

abstracted Group TitleBest ResponseYou've already chosen the best response.2
Yup\[g(x)=f(x4)=\sqrt{9(x4^2)}\]
 2 years ago

Calcmathlete Group TitleBest ResponseYou've already chosen the best response.0
So it would be: \[g(x) = \sqrt{x^2 + 8x  7}~?\]
 2 years ago

abstracted Group TitleBest ResponseYou've already chosen the best response.2
Yes you could simplify it further to what you did,. Just another example: If it was \[g(x)=f(x+5x^2)\] Then:\[g(x)=f(x+5x^2)=\sqrt{9(x+5x^2)^2}\]
 2 years ago

Calcmathlete Group TitleBest ResponseYou've already chosen the best response.0
Oh I get it...but for more practical uses, it would be just left as \[g(x) = \sqrt{9  (x  4)^2}~?\]
 2 years ago

abstracted Group TitleBest ResponseYou've already chosen the best response.2
That's how I would leave it, unless your professor told you otherwise
 2 years ago

Calcmathlete Group TitleBest ResponseYou've already chosen the best response.0
Alright. THank you :) Just needed a quick refresher since I forgot how to do these momentarily!
 2 years ago
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