Question

What is the value of the expression below when x = 4?7x2 + 8x - 7

Answer 1

We just need to replace x by 4 on the initial expression as:

$\begin{gathered} 7x^2+8x-7 \\ 7(4)^2+8(4)-7 \\ 7(16)+8(4)-7 \\ 112+32-7 \\ 137 \end{gathered}$

Answer: 137