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Question
Solve for x: 9x2 – 6px + (p2 – q2) = 0
Solution
a = 9, b = − 6p, c = p2 − q2
D = b2 − 4ac = (− 6p)2 − 4(9)(p2 − q2) = 36q2
x = `(- b +- sqrt(D))/(2q) = (6p +- 6q)/18 = (p + q)/3` or `(p - q)/3`
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