Question

Which shows one way to determine the factors of x3 + 4x2 + 5x + 20 by grouping?x(x2 + 4) + 5(x2 + 4)x2(x + 4) + 5(x + 4)x2(x + 5) + 4(x + 5)x(x2 + 5) + 4x(x2 + 5)

Answer 1

B. x2(x + 4) + 5(x + 4)

Answer 2

x3 + 4x2 + 5x + 20

= x2(x + 4) + 5(x+4)

answer is b. x2(x + 4) + 5(x + 4) (second choice)