Question:
Tick (✓) the correct answer:
40 + 3x − x2 = ?
(a) (x + 5)(x − 8)
(b) (5 − x)(8 + x)
(c) (5 + x)(8 − x)
(d) (5 − x)(8 − x)
Solution:
(c) (5 + x)(8 − x)
$40+3 x-x^{2}$
$=40+8 x-5 x-x^{2}$
$=8(5+x)-x(5+x)$
$=(8-x)(x+5)$
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