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2014-08-18T10:26:19-03:00
 x^{2} -10x +21=0

Δ= 100 - 4.1.21
Δ = 100 - 84
Δ = 16

x =  \frac{10 +- 4}{2}
x1 = 14/2 = 7
x2 = 6/2 = 3
3 5 3
2014-08-18T10:30:27-03:00
X² - 10X =21
Δ= 16
x1= 7
x2= 3
1 3 1