Ada draws the graph of y = x 2 - x - 2 and y
MATHEMATICS
WAEC 2015
Ada draws the graph of y = x2 - x - 2 and y = 2x - 1 on the same axes. Which of these equations is she solving?
- A. x2 - x - 3 = 0
- B. x2 - 3x - 1 = 0
- C. x2 - 3x - 3 = 0
- D. x2 + 3x - 1 = 0
Correct Answer: B. x2 - 3x - 1 = 0
Explanation
Given; y = x2 - x - 2, y = 2x - 1
Using y = y, gives
x2 - x - 2 = 2x - 1
x2 - 3x - 2 + 1 = 0
therefore, x2 - 3x - 1 = 0
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