$(2 x + 4) (2 x + b)$ = .

4 x^{2} + 4 x + b x + 4 b

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4 x^{2} - 4 x - b x - 4 b

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x^{2} + x + b x + 4 b

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x^{2} - x - b x - 4 b

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Solution

The correct option is A $4 x^{2} + 4 x + b x + 4 b$
$(2 x + 4) (2 x + b) = (2 x)^{2} + (4 + b) x + 4 b$
$[(x + a) (x + b) = x^{2} + (a + b) x + a b]$
So, $(2 x + 4) (2 x + b) = 4 x^{2} + 4 x + b x + 4 b$

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