pls ans very urgent 5 pls
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If a quadratic equation has equal roots then Determinant = 0
⇒ b² - 4ac = 0
⇒ b² = 4ac
⇒ (m + 2)² = 4(1)(m + 5)
⇒ m² + 4m + 4 = 4(m + 5)
⇒ m² + 4m + 4 = 4m + 20
⇒ m² = 4m + 20 - 4m - 4
⇒ m² = 16
⇒ m = ±4
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