Question

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Answer 1

ANSWER

C. 28

EXPLANATION

The given expression is

${x}^{2} - 7x + 10$

We want to evaluate this function at x=-2.

We just have to substitute x=-2 into the given expression.

In other words, we have to replace x with -2 wherever we see x in the expression

${( - 2)}^{2} - 7( - 2) + 10$

We evaluate the exponent to get

$4 - 7( - 2) + 10$

We multiply next to get:

$4 + 14+ 10$

We now add to obtain:

$28$

The correct answer is C