Resposta:
Explicação passo a passo:
a.
x(x+3)=0
x=0
x+3=0
x=0-3
x=-3
S={-3,0}
b.
X²+x=0
x(x+1)=0
x+1=0
x=0-1
x=-1
S={-1,0}
c.
2x²-12x=0
2x(x-6)=0
2x=0
x=0/2
x-6=0
x=0+6
x=6
S={0,6}
d.
x²-9=0
x²=0+9
x²=9
x=√9
x'=3
x''=-3
S={-3,3}
e.
25x²-100=0
25x²=0+100
25x²=100
x²=100/25
x²=4
x=√4
x'=-2
x''=+2
S={-2,2}
f.
x(2-x)=0
2-x=0
-x=0-2
-x=-2 (-1)
x=2
S={0,2}
g.
x²-3x=6x
x²-3x-6x=0
x²-9x=0
x(x-9)=0
x-9=0
x=0+9
x=9
S={0,9}
h.
x(x-5)=0
x-5=0
x=0+5
x=5
S={0,5}
i.
2x²-50=0
2x²=0+50
2x²=50
x²=50/2
x²=25
x=√25
x'=-5
x''=5
S={-5,5}
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Resposta:
Explicação passo a passo:
a.
x(x+3)=0
x=0
x+3=0
x=0-3
x=-3
S={-3,0}
b.
X²+x=0
x(x+1)=0
x=0
x+1=0
x=0-1
x=-1
S={-1,0}
c.
2x²-12x=0
2x(x-6)=0
2x=0
x=0/2
x=0
x-6=0
x=0+6
x=6
S={0,6}
d.
x²-9=0
x²=0+9
x²=9
x=√9
x'=3
x''=-3
S={-3,3}
e.
25x²-100=0
25x²=0+100
25x²=100
x²=100/25
x²=4
x=√4
x'=-2
x''=+2
S={-2,2}
f.
x(2-x)=0
x=0
2-x=0
-x=0-2
-x=-2 (-1)
x=2
S={0,2}
g.
x²-3x=6x
x²-3x-6x=0
x²-9x=0
x(x-9)=0
x=0
x-9=0
x=0+9
x=9
S={0,9}
h.
x(x-5)=0
x=0
x-5=0
x=0+5
x=5
S={0,5}
i.
2x²-50=0
2x²=0+50
2x²=50
x²=50/2
x²=25
x=√25
x'=-5
x''=5
S={-5,5}