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3x2 + 2x – 1 = 0

(ii) 3x2 + 2x – 1 = 0

Sol. 3x2 + 2x – 1 = 0
Comparing with ax2 + bx + c = 0 we have a = 3, b = 2, c = – 1
 = b2 – 4ac
= (2)2 – 4 (3) (– 1)
= 4 + 12
= 16

∴ ∆  = 16