Question

Use synthetic substitution to find f(-5) and f (2) for the function.

f(x) = 2x³ - 8x² - 2x + 5
f(-5) =
f(2)=

Answer 1

f(-5) = -85 and f(2) = -7

Explanation:

To find f(-5) and f(2), we can simply substitute -5 and 2 into the function in place of the variable x.

f(-5) = 2(-5)³ - 8(-5)² - 2(-5) + 5 = -50 - 40 + 10 + 5 = -85

f(2) = 2(2)³ - 8(2)² - 2(2) + 5 = 16 - 32 + 4 + 5 = -7