4x2 + 7x + 2 = 0


(xii) 4x2 + 7x + 2 = 0
Sol. 4x2 + 7x + 2 = 0
Comparing with ax2 + bx + c = 0 we have a = 4, b = 7, c = 2
b2 – 4ac = (7)2 – 4 (4) (2)
= 49 – 32
= 17
By Formula method,

x
=
-  b ± √(b2 – 4ac)




2a







∴ x
=
-(7) ± √17




2(4)







∴ x
=
-7 ±√17




8







∴ x
=
-7 + √17  
or
-7 - √17


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