x2 + 3x – 2 = 0

(ii) x² + 3x – 2 = 0

Sol. x² + 3x – 2 = 0

Comparing with ax² + bx + c = 0 we have a = 1, b = 3, c = –2

b² – 4ac = (3)² – 4(1) (–2)

= 9 + 8

= 17

By Formula method,

x	=	-  b ± √(b2 – 4ac)
		2a
∴ x	=	-(3)± √17
		2(1)
∴ x	=	-3 ± √17
		2
∴ x	=	-3+√17	or	-3-√17
		2		2