Tick (✓) the correct answer

Question:

Mark (✓) against the correct answer:

3 + 23x − 8x2 = ?

(a) (1 − 8x)(3 + x)

(b) (1 + 8x)(3 − x)

(c) (1 − 8x)(3 − x)

(d) none of these

Solution:

(b) (1 + 8x)(3 − x)

$3+23 x-8 x^{2}$

$=3+24 x-x-8 x^{2}$

$=3(1+8 x)-x(1+8 x)$

$=(1+8 x)(3-x)$

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