Question

Evaluate: f(x) = 2x^2 + 6x - 4; f(-5) *

Answer 1

$f(x)=2x^2+6x-4$

Find the f(-5) by substituting x = -5 in the equation.

$f(-5)=2(-5)^2+6(-5)-4\\f(-5)=2(25)-30-4\\f(-5)=50-34\\f(-5)=16$

Therefore, the answer is f(-5) = 16.