Question: a) Expand (1 + 2x). b) Show that (1 + 2x) + (1 2x) = 2(1 + 12x). c) Hence solve (1 + 2x)

a) Expand (1 + 2x)³.

b) Show that
(1 + 2x)³ + (1 − 2x)³ = 2(1 + 12x²).

c) Hence solve (1 + 2x)³ − (1 − 2x)³ = 8.

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