Simplify:
$(x + 3) (x + 5)$
[Using $(x + a) (x + b) = x^{2} + (a + b) x + a b$ ]

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Solution

$(x + 3) (x + 5)$
Using $(x + a) (x + b) = x^{2} + (a + b) x + a b$
$= x^{2} + (3 + 5) x + 3 \times 5$
$= x^{2} + 8 x + 15$

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