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cmcox · Oct 17, 2011, 07:10 PM

f(x) = x^2 - 12x 36

find a value of x such that f(x)= 9

ebaines · Oct 18, 2011, 05:50 AM

First, I assume that what you meant to write is:
f(x) = x^2 -12x +36

Please confirm.

You know this equals 9, so:

$<br /> 9 = x^2 -12 x +36<br />$

Subtract 9 from both sides:

$<br /> 0 = x^2 -12x +27<br />$

Now you can factor this and find two solutions for x. Post back with what you get for answers and we'll check it for you.