Question

3x^3-9x^2-x+8 when x=2

Answer 1

as x=2
3*2*2*2-9*2*2-2+8=P(x)
24-36-2+8
-12+8
=-6

hope now u will under stand

Answer 2

3*2^3-9*2^2-2+8=3*8-9*4-2+8
=24-36-2+8=32-36-2=-4-2=-6