Encontre as raizes das equacoes abaixo :
A)x2-2x-15=0
B)x2+x-2=0
C)x2+3x-4=0
D)x2+6x+8=0
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A)x2-2x-15=0
-b/c = 2/-15 = 5-3/5.-3 => x'=5 , x"= -3
B)x2+x-2=0
-b/c = -1/-2 = 1-2/1.-2 => x'=1 , x"= -2
C)x2+3x-4=0
-b/c = -3/-4 = 1-4/1.-4 => x'=1 , x"= -4
D)x2+6x+8=0
-b/c = -6/8 = -2-4/-2.-4 => x'=-2 , x"=-4
-b/c = 2/-15 = 5-3/5.-3 => x'=5 , x"= -3
B)x2+x-2=0
-b/c = -1/-2 = 1-2/1.-2 => x'=1 , x"= -2
C)x2+3x-4=0
-b/c = -3/-4 = 1-4/1.-4 => x'=1 , x"= -4
D)x2+6x+8=0
-b/c = -6/8 = -2-4/-2.-4 => x'=-2 , x"=-4
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