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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)

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Solution

(c) (5 + x)(8 − x)

40+3x-x2=40+8x-5x-x2=8(5+x)-x(5+x)=(8-x)(x+5)

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