The coefficient of $x$ in $(x + 7) (x - 9)$ is

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-2

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-1

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Solution

The correct option is B -2
$(x + a) (x - b) = x^{2} + (a - b) x - a b$

$(x + 7) (x - 9) = x^{2} + (7 - 9) x - (7) (9)$

= $x^{2} - 2 x - 63$

$∴$ coefficient of $x$ is -2

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