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Outsourcing and Its Types

In the expans...

Question

In the expansion of $(5 x - 3) (x + 2)^{2}$ , find the coefficient of $x$ .

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Solution

$(5 x - 3) (x + 2)^{2} = (5 x - 3) (x^{2} + 4 x + 4)$

$5 x^{3} + 20 x^{2} + 20 x - 3 x^{2} - 12 x - 12$

$5 x^{3} + 17 x^{2} + 8 x - 12$

$∴$ Coefficient of $x = 8$

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