Solve the equation 2a 2 - 3a - 27 = 0
MATHEMATICS
WAEC 1990
Solve the equation 2a2 - 3a - 27 = 0
- A. 3/2, 9
- B. -2/3, 9
- C. 3, 9/2
- D. -3, 9/2
Correct Answer: D. -3, 9/2
Explanation
2a2 - 3a - 27 = 0
2a2 - 9a + 6a - 27 = 0
a(2a - 9) + 3(2a - 9) = 0
(a + 3)(2a - 9) = 0
a = -3 or a = 92
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