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2014-06-10T08:51:52-03:00
Bhasckara.

4x²- 9x+2 =0

Δ= b² - 4.a.c 
Δ=- 9² -4 .4.2
Δ= 81 -32
Δ= 49

x= - b+/- 
√Δ/4.a

x= -(-9) +/- √49 / 4.4

x= 9 +/ 7 / 16

x'= 9+7/16= 16/16 =1

x''= 9-7/16 =2/16

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