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
$3+23 x-8 x^{2}$
$=3+24 x-x-8 x^{2}$
$=3(1+8 x)-x(1+8 x)$
$=(1+8 x)(3-x)$
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