If $l$ and $m$ are the roots of equation $x^{2} - 8 x + 15 = 0$ , then the value of $l m$ is :

\sqrt{2}

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15

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4

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4 \sqrt{2}

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Solution

The correct option is D $15$
If $l$ and $m$ are the roots of $x^{2} - 8 x + 15 = 0$ , then
$l m =$ product of root of the given quadratic $= \frac{constant term}{coeff. of x^{2}} = \frac{15}{1} = 15$

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