Answer :
y = 4x + 2x² - x³
When x=2 . . .
x = 2
x² = 4
x³ = 8
4x + 2x² - x³ = 4(2) + 2(4) - (8)
= 8 + 8 - 8
= 8
y = 8
When x=2 . . .
x = 2
x² = 4
x³ = 8
4x + 2x² - x³ = 4(2) + 2(4) - (8)
= 8 + 8 - 8
= 8
y = 8