Solve the equation 3x 2 + 25x -18 = 0
MATHEMATICS
WAEC 1995
Solve the equation 3x2 + 25x -18 = 0
- A. -3,2
- B. -2,3
- C. -2,9
- D. -9,2/3
Correct Answer: D. -9,2/3
Explanation
3x\(^2\) + 25x - 18 = 0
3x\(^2\) + 27x - 2x - 18 = 0
3x(x + 9) - 2(x + 9) = 0
(3x - 2)(x + 9) = 0
x = \(\frac{2}{3}\) or x = -9.
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