Question

Determine whether $(x + 1)$is a factor of the following polynomial:

$3 x^3 + 8 x^2 - 6 x - 5$

Answer 1

X(-1)=3*(-1)³+8*(-1)²-6*(-1)-5
= -3+8+6-5
=14-8
=6
SO (X+1) IS NOT THE FACTOR OF THE POLYNOMIAL

Answer 2

divide (x+1) from  3x³ + 8x² - 6x - 5
i.e. we get a remainder 6 so we get that (x+1) is not a factor of the polynomial .