1. Find the discriminant of the following quadratic equations and hence find the nature of roots : (i) 3x^2 – 5x – 2 = 0 (ii) 2x^2 – 3x + 5 = 0 (iii) 16x^2 – 40x + 25 = 0 (iv) 2x^2 + 15x + 30 = 0.
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