Question:
Tick (✓) the correct answer:
(x + 5)(x − 3) = ?
(a) x2 + 5x − 15
(b) x2 − 3x − 15
(c) x2 + 2x + 15
(d) x2 + 2x − 15
Solution:
(d) x2 + 2x − 15
$(2 x+3)(3 x-1)$
$\Rightarrow(2 x)(3 x-1)+(3)(3 x-1)$
$\Rightarrow 6 x^{2}-2 x+9 x-3$
$\Rightarrow 6 x^{2}+7 x-3$
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