If $(3 x - 4) (5 x + 7) = 15 x^{2} - a x - 28$ then a = .........

1

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- 1

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- 2

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none of these

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Solution

The correct option is A $- 1$
(3x - 4) (5x + 7) = $15 x^{2} - a x - 28$
$15 x^{2} + x - 28 = 15 x^{2} - a x - 28$
Comparing we get a = -1

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