Quadratic Equations - Arithmetic Aptitude Questions and Answers

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Find the roots of quadratic equation: x² + x - 42 = 0?

-6, 7

-8, 7

14, -3

-7, 6

3, -14

Answer : Option D

Explanation :

x² + 7x - 6x + 42 = 0
x(x + 7) - 6(x + 7) = 0
(x + 7)(x - 6) = 0 => x = -7, 6

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