Factorise the following
a) a-b
b)x³-x
c)a²+3a²+4
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- x³ - x
→ x(x² - 1)
→ x[(x + 1)(x - 1)]
- a² + 3a² + 4
→ a²(1 + 3) + 4
→ a²(4) + 4
→ 4(a² + 1)
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