Question:
Tick (✓) the correct answer:
x3 − x = ?
(a) x(x2 − x)
(b) x(x − x2)
(c) x(1 + x)(1 − x)
(d) x(x + 1)(x − 1)
Solution:
(d) x(x + 1)(x − 1)
$x^{3}-x$
$=x\left(x^{2}-1\right)$
$=x(x-1)(x+1)$
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