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2014-05-22T01:12:12-03:00
3z²-21=6z²+21z
3z²-6z²-21z-21=0
-3z²-21z-21=0
D=(-21²)-4.(-3).(-21)
D=441-252D=189
189/3
63/3
11/11
x'= 21+3Raizde11/2.(-3)
x'= 21+3Raizde11/-6
x"= 21-3Raizde11/2.(-3)
x"= 21-3Raizde11/-6
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