Question

Evaluate the functions F(x) = 2x -4 for the following values F(-2) = ?F ( ? ) = 8

Answer 1

we have: f(x) = 2x - 4

for f ( - 2 ):

$f(-2)=2(-2)-4=-4-4=-8$

answer:

for f(?) = 8

$\begin{gathered} 2x-4=8 \\ 2x-4+4=8+4 \\ 2x=12 \\ \frac{2x}{2}=\frac{12}{2} \\ x=6 \end{gathered}$

answer: f ( 6 ) = 8