Question

Expand (x-5)(x+2)(x+7)

Answer 1

x³ + 4x² - 31x - 70

Explanation:

Step 1: Expand (x - 5) and (x + 2)

(x - 5)(x + 2) = x² + 2x - 5x - 10 = x² - 3x - 10

Step 2: Expand (x² - 3x - 10) and (x + 7)

(x² - 3x - 10)(x + 7) = x³ - 3x² - 10x + 7x² - 21x - 70 = x³ + 4x² - 31x - 70