Which of the following quadratic equation has roots –3 and –5?

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X2 + 8X + 15 = 0 Explanation: The roots of the quadratic equation x2 + 8x + 15 = 0 are x2 + 5x + 3x + 15 = 0 ...`((5 xx 3 = + 15),(5 + 3 = + 8))` x(x + 5) + 3(x + 5) = 0 (x + 5)(x + 3) = 0 ∴ x + 5 = 0 x = –5 ∴ x + 3 = 0 x = –3

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