Tick (✓) the correct answer:
(2x − 32x3) = ?
(a) 2(x − 4)(x + 4)
(b) 2x(1 − 2x)2
(c) 2x(1 + 2x)2
(d) 2x(1 − 4x)(1 + 4x)
$\left(2 x-32 x^{3}\right)$
$=2 x\left(1-16 x^{2}\right)$
$=2 x(1-4 x)(1+4 x)$
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