square root of y-15 + square root of y equals 15

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1 Answer

sqrt(y - 15) + sqrt(y) = 15

y - 15 + 2sqrt(y^2 - 15y) + y = 15

2sqrt(y^2 - 15y) = -2y + 30

sqrt(y^2 - 15y) = -y + 15

y^2 - 15y = y^2 - 30y + 225

15y = 225

y = 15
by Level 13 User (103k points)

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