resolva as equações do 2º grau :
a) x²-5x+6=0
b)x²-8x+12=0
c)x²+2x-8=0
d)x²-5x+8=0
e)2 x²-8x+8=0
f)x²-4x-5=0
g)-x²+6x-5=0
h)x²+3x+2=0
i)x²-7x+12=0
j)x²-6x+9=0
Soluções para a tarefa
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delta e bhaskara
-b+-√b²-4.a.c/2.a
a)-(-5)+-√(-5)²-4.1.6/2.1
5+-√25-24/2
5+-√1/2
x+=5+1/2=6/2=3
x-=5-1/2=4/2=2
b)-(-8)+-√(-8)²-4.1.12/2.1
8+-√64-48/2
8+-√16/2
x+=8+4/2=12/2=6
x-=8-4/2=4/2=2
c)2+-√2²-4.1.(-8)/2.1
2+-√4+32/2
2+-√36/2
x+=2+6/2=8/2=4
x-=2-6/2=-4/2=-2
e assim por diante
d)x+=2,5+1,32i
x-=2,5-1,32i
e)x+=2
x-=2
f)x=-1
x=5
g)x=1
x=5
h)x=-2
x=-1
i)x=3
x=4
j)x=3
x=3
-b+-√b²-4.a.c/2.a
a)-(-5)+-√(-5)²-4.1.6/2.1
5+-√25-24/2
5+-√1/2
x+=5+1/2=6/2=3
x-=5-1/2=4/2=2
b)-(-8)+-√(-8)²-4.1.12/2.1
8+-√64-48/2
8+-√16/2
x+=8+4/2=12/2=6
x-=8-4/2=4/2=2
c)2+-√2²-4.1.(-8)/2.1
2+-√4+32/2
2+-√36/2
x+=2+6/2=8/2=4
x-=2-6/2=-4/2=-2
e assim por diante
d)x+=2,5+1,32i
x-=2,5-1,32i
e)x+=2
x-=2
f)x=-1
x=5
g)x=1
x=5
h)x=-2
x=-1
i)x=3
x=4
j)x=3
x=3
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