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2y² - 15 = y² + 2y
2y² - y² -2y -15 = 0
y² - 2y - 15 = 0
(y - 5)(y + 3) = 0
y - 5 =0
y = 5
atau
y + 3 =0
y = -3
y² - 3 = 2y
y² - 2y - 3 = 0
(y - 3)(y + 1) = 0
y - 3 = 0
y = 3
atau
y + 1 = 0
y = -1