WAEC - Mathematics (1994 - No. 21)
Which of the following equations can be solved by the points of intersection P and Q of the curve and the line PQ?
x2 - 2 = 0
x2 - 4 = 0
x2 + 6 = 0
X2 - X – 2 = 0
x2 - x + 4 = 0
Explanation
The points of intersection of the curve and the line are at x = -2 and x = 2.
\(\therefore\) (x + 2) = 0; (x - 2) = 0.
(x + 2)(x - 2) = 0
\(x^2 - 4 = 0\)
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