Question

Which shows one way to determine the factors of x3 + 5x2 – 6x – 30 by grouping?

x(x2 – 5) + 6(x2 – 5)
x(x2 + 5) – 6(x2 + 5)
x2(x – 5) + 6(x – 5)
x2(x + 5) – 6(x + 5)
Mark this and return

Answer 1

x²(x + 5) - 6(x + 5)

Explanation:

x³ + 5x² - 6x - 30 ← factor out x² from the first two terms and - 6 from the next two terms.

x²(x + 5) - 6(x + 5)