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

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Solution

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

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