Question 1092270
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Evaluate the function f(x)=7x+7 at the given values of the independent variable and simplify

f(x)= x^2+6x-8

thank you so much
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{{{f(x)=7x+7}}}, for WHICH given values?
This is a line.  Steep and positive slope, with point  (0,7) included.
{{{graph(300,300,-3,13,-4,12,7x+7)}}}
Pick the point you need.




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{{{f(x)=x^2+6x-8}}}, is already "simplified".  You could, if you want, change its form so to be able to read its vertex.  (Otherwise, not factorable, this trinomial).

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{{{x^2+6x+9-9-8}}}
{{{x^2+6x+9-17}}}
{{{f(x)=(x+3)^2-17}}}