Question

How do we find f and g for the following functions?

Answer 1

Given the functions:

$\begin{gathered} f(x)=5x+2 \\ g(x)=-2x^2-3 \end{gathered}$

• You need to find:

$f(-7)$

Then, you have to substitute this value of "x" into the function "f" and then evaluate:

$x=-7$

Then, you get:

$f(-7)=5(-7)+2=-35+2=-33$

• Now you need to find:

$g(6)$

Substitute this value of "x" into the function "g" and then evaluate:

$x=6$

You get:

$g(6)=-2(6)^2-3=-2(36)-3=-72-3=-75$

Hence, the answer is:

$\begin{gathered} f(-7)=-33 \\ g(6)=-75 \end{gathered}$