Question

Solve for x.

x2 + 4x - 21 = 0

A.) -3,-7
B.) -3,7
C.) 3,-7
D.) 3,7

Answer 1

C) 3,-7

Explanation:

x² + 4x - 21 = 0 (Given)

(x+7)(x-3) = 0 (Factor)

x+7 = 0 and x-3 = 0 (Zero Product Property)

x = -7 and x = 3 (Final Solutions)

Therefore, C is correct