Question

Evaluate -2x^2-4x+3 when x=-2

Answer 1

3

Explanation:

A polynomial is sometimes easier to evaluate if it is first written in Horner form:

-2x^2 -4x +3 = (-2x -4)x +3

For x = -2, this is ...

(-2(-2) -4)(-2) +3 = 0(-2) +3 = 3

The value is 3 when x = -2.