y² - 2y - 15 = 0
y² + 3y - 5y - 15 = 0
y × (y + 3) - 5 × (y + 3) = 0
(y + 3) × (y - 5) = 0
y¹ = - 3
y² = 5
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y² - 2y - 15 = 0
y² + 3y - 5y - 15 = 0
y × (y + 3) - 5 × (y + 3) = 0
(y + 3) × (y - 5) = 0
y¹ = - 3
y² = 5