Applying zero product rule for the equation $x^{2} - a x - 30 = 0$ is $x = 10$ , then $a =$ _____.

6

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7

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8

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9

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Solution

The correct option is B $7$
Applying zero product rule for the equation $x^{2} - a x - 30 = 0$
Put the value of $x = 10$ in the above equation,
$10^{2} - a (10) - 30 = 0$
$100 - 10 a = 30$
$100 - 30 = 10 a$
$a = 7$

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