Tick (✓) the correct answer
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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