The co-efficient of $x$ when we multiply $(5 x^{2} - 4 x + 3)$ by $(5 - 4 x)$ is

- 30

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- 31

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- 32

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none of these

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Solution

The correct option is C $- 32$
When we multiply $(5 x^{2} - 4 x + 3)$ by $(5 - 4 x)$ we get,
$(5 x^{2} - 4 x + 3) \times (5 - 4 x)$
$= - 20 x^{3} + 41 x^{2} - 32 x + 15$ .
So the co-efficient of $x$ is $- 32$ .

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