Question

(c) Solve the equation 7x³ +28x² = 0

Answer 1

first х=0 second х=-4

Answer 2

x = - 4 , x = 0

Explanation:

7x³ + 28x² = 0 ← factor out 7x² from each term on the left side

7x²(x + 4) = 0

equate each factor to zero and solve for x

7x² = 0 ⇒ x² = 0 ⇒ x = 0

x + 4 = 0 ⇒ x = - 4