Question

3) When x = - 1 what is the value of the polynomial 2x2 + 5x3 +7
options
О
7
-4
4​

Answer 1

x=1

then 2x2=2×-1×2=(-4)

now 5x3+7=5×-1×3+7=(-12)

-4+-12=(-16)

Answer 2

Answer

2 x 2 = 4 + 5 x 3 = 15

step

-4