Solve the following equation by factorisation:
x2 - 4x - 12 = 0 when x ∈ N
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3(x - 2)2 = 147
2x2 - 9x + 10 = 0 , when
(i) x ∈ N(ii) x ∈ Q
a2x2 + 2ax + 1 = 0 , a ≠ 0.