Find the roots of quadratic equation: x2 + x – 42 = 0?
A. -6, 7
B. -8, 7
C. 14, -3
D. -7, 6
Explanation:
x2 + 7x – 6x + 42 = 0
x(x + 7) – 6(x + 7) = 0
(x + 7)(x – 6) = 0 => x = -7, 6