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$The value of a - bx + {cx}^{2} at x = \frac{a}{b} is$

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$a 2 c b$

$a c 2 b 2$

$a 2 c 2 b 2$

$a 2 c b 2$

answer is A.

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Detailed Solution

given

$x = a b$

then

$a − b x + c x 2$

$a − b a b + c a b 2$

$⇒ a − a + c a 2 b 2$

$⇒ c a 2 b 2 or a 2 c b 2$

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