Question

Which of the following is NOT a zero of the polynomial shown below?

f(x)=2x^4-x^3-42x^2+16x+160

Answer 1

2x^4-x^3-42x^2+16x+160 = 0
2(-4)^4-(-4)^3-42(-4)^2+16(-4)+160
2(256) - (-64) - 42(16) -64 + 160
512 + 64 - 672 - 64 + 160
576 - 672 - 64 + 160
-96 - 64 + 160
-160 + 160
0

Answer 2

its -4

Answer 3

Thanks

Answer 4

your welcome :)