Question

If f(x) = 2x² + 3x - 19, find f(-4)

Answer 1

f(-4)=1

Explanation:

f(x) = 2x² + 3x - 19

f(-4)=2(-4)² + 3(-4)-19

f(-4)=2(-16)+3(-4)-19

f(-4)=-32+3(-4)-19

f(-4)=32-12-19

f(-4)=20-19

f(-4)=1

Answer 2

2(-4)^2+3(-4)-19
32+(-12)-19= 1