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Discriminant

The roots of ...

Question

The roots of the equation $x^{2} - 9 x + 20 = 0$ are

4

and

5

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4

and

- 5

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- 4

and

5

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- 4

and

- 5

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Solution

The correct option is A $4$ and $5$
Given equation is:
$x^{2} - 9 x + 20 = 0$
$\Rightarrow x^{2} - 5 x - 4 x + 20 = 0$
$\Rightarrow (x - 4) (x - 5) = 0$
$\Rightarrow x = 4 a n d x = 5$

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