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Solving a Quadratic Equation by Factorization Method

The roots of ...

Question

The roots of the quadratic equation $x^{2} + 7 x + 12 = 0$ are :

- 4, - 3

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4, - 3

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4, 3

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- 4, 3

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Solution

The correct option is B $- 4, - 3$
The equation can be solved using factorisation:
$\Rightarrow x^{2} + 3 x + 4 x + 12 = 0$
$\Rightarrow (x + 3) (x + 4) = 0$
So, the values come out to be $x = - 3, x = - 4$

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