Evaluate 2x^3 + 5x^2 + 4x + 8 when x = - 2

4

Step-by-step explanation:

Given the function 2x³ + 5x² + 4x + 8. In order to evaluate the value of the function at x = - 2 we will substitute the value of x given into the function as shown;

F (x) = 2x³ + 5x² + 4x + 8

at x = - 2

f (-2) = 2 (-2) ³ + 5 (-2) ² + 4 (-2) + 8

f (-2) = 2 (-8) + 5 (4) + (-8) + 8

f (-2) = - 16+20-8+8

f (-2) = - 16+20

f (-2) = 4

The value of the function when x = - 2 is 4