Question

$(x + a)(x + b) = x { } ^{2} + (a + b)x + ab$
$(x + 7)(x + 5)$
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Answer 1

${\huge[\underline{\boxed{\tt{\color{red}{Answer}}}}}$

Given:

$(x + a)(x + b) = {x}^{2} + (a + b)x + ab \\ x = x \\ a = 7 \\ b = 5$

Inserting the formula with the given values:-

${x}^{2} + (7 + 5)x + (7 \times 5) \\ ⇛x + (12)x + 35 \\ ⇛x + 12x + 35 \\ ⇛13x + 35$

∴ The answer is: 13x + 35.

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