Solve the following equation by factorisation:
x2 - (p + q)x + pq = 0
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2x2 - 9x + 10 = 0 , when
(i) x ∈ N(ii) x ∈ Q
a2x2 + 2ax + 1 = 0 , a ≠ 0.
a2x2 + (a2 + b2)x + b2 = 0, a ≠ 0.