Question

What is the value of the expression below when x=4x=4? 7x^2 +8x-7 7x 2 +8x−7

Answer 1

Answer: 137

Step-by-step explanation:

The given expression: $7x^2 +8x-7$

We need to find the value of the expression when x=4.

So we just use the substitution property and substitute the value of x= 4 in the given expression , we get

$7(4)^2+8(4)-7\\\\= 7(16)+32-7\\\\= 112+25\\\\=137$

Hence, the value of the expression at x=4 is 137.