Find the solution of the equation \(x - 8\sqrt{x} + 15 = 0\)

Assessment: JAMB UTME - Mathematics - 1990 Subject: General Mathematics

Question 1 Report

Find the solution of the equation \(x - 8\sqrt{x} + 15 = 0\)

Answer Details
x - 8 x  + 15 = 0
x + 15 = 8 x
square both sides = (x + 15)2 = (8  x 2
x2 + 225 + 30x = 64x
x2 + 225 + 30x - 64x = 0
x2 - 34x + 225 = 0
(x - 9)(x - 25) = 0
x = 9 or 25

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