Question

Factor: −30x2−10x
A. −10x(3x+1)
B. −40x(3x+1)
C. −10x(3x2+1)
D. −20(3x2+x)

Answer 1

Solution. If (x + 1) is a factor of p(x) = x4 + x3 + x2 + x + 1, then p (−1) must be zero, otherwise (x + 1) is not a factor of p(x). As p(− 1) ≠ 0, Therefore, x + 1 is not a factor of this polynomial.