Find the smaller value of x that satisfies the equation x 2 + 7x +
MATHEMATICS
WAEC 2011
Find the smaller value of x that satisfies the equation x2 + 7x + 10 = 0
- A. -5
- B. -2
- C. 2
- D. 5
Correct Answer: A. -5
Explanation
x2 + 7x + 10 = 0
x2 + 5x + 2x + 10 = 0
x(x + 5) + 2(x + 5) = 0
(x + 2)(x + 5) = 0
x + 2 = 0 or x + 5 = 0
x = -2 or x = -5
the smaller value x = -5
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