Evaluating Polynomials Examples

What is the value of the polynomial 4x² + 3x + 5 when x = -1?

Plug in -1 for x to get:

4(-1)² + 3(-1) + 5 =
4 – 3 + 5 =
6

If x = 2 and y = 3, what is the value of the polynomial 4xy + x² – xy³?

Substitute 2 for x and 3 for y to get:

4(2)(3) + (2)² – (2)(3)³ =
24 + 4 – 54 =
-26