Solve the following equation by factorization:
5x2 - 12x - 9 = 0, when (i) x ∈ I (ii) x ∈ Q
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3a2x2 + 8abx + 4b2 = 0, a ≠ 0
4x2 - 4ax + (a2 - b2) = 0, where a, b ∈ R.
2x2 - 11x + 15 = 0, when (i) x ∈ N (ii) x ∈ I