$\displaystyle f(x)=2x-7$

Find:

I)$\displaystyle f(3x+2)$

II)$\displaystyle f^{-1}(x)$

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- Jan 26th 2009, 11:49 AMwilliamquadratics help
$\displaystyle f(x)=2x-7$

Find:

I)$\displaystyle f(3x+2)$

II)$\displaystyle f^{-1}(x)$ - Jan 26th 2009, 12:20 PMMush
- Jan 26th 2009, 12:24 PMwilliam
- Feb 22nd 2009, 10:24 PMmr fantastic
1. I don't know why you would use the word quadratics in the title of this thread since it is totally irrelevant to the question.

2. Does the question ask you to expand? Does anyone expect you to expand? Has the question been answered if you**don't**expand? Capisce? - Feb 24th 2009, 03:38 PMarpitagarwal82
I think the answer to the inverse will not be this. (second part of question).

While taking inverse, first add 7 and then divide whole thing by 2.

$\displaystyle y = 2x - 7$

=> $\displaystyle y + 7 = 2x$

$\displaystyle => x = (y + 7)/2$

So inverse function is$\displaystyle f^-1(x) = (x +7)/2$