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2014-06-02T18:26:15-03:00
X²-4x+4=9
X²-4X+4-9=0
X²-4X-5=0
b²-4ac
(-4)²-4(1).(-5)
16+20
36

-b+/-raiz  de 36 /2a
-(-4)+/-6/2.1
4+/-6/2

x'=4+6/2
x'=10/2
x'=5

x''=4-6/2
x''=-2/2
x''=-1

S={-1,5}
3 3 3
(b)² - 4. a.c > (-4)² - 4. 1. (-5) >
16 + 20 = 36
x= -b + ou - 6 /2
x¹= 10/2 = 5
x²= -2/2 = -1