Verified answer

-4x²-12x=0, (-1)

4x²+12x=0, divide por 4

x²+3x=0

x(x+3)=0

x=0

ou

x+3=0

x=-3

b)x²-10x+25-2=23

x²+10x=0

x(x+10)=0

x=0

x+1=0

x=-10

m)10(m-2)=8

10m-20=8

10m=8+20

10m=28

m=28/10

m=14/5

a) http://www.wolframalpha.com/input/?i=4x%C2%B2-12x%...

x' = 0

x" = 3

b) (x+5)²-2=23

x' = -10

x" = 0

http://www.wolframalpha.com/input/?i=%28x%2B5%29%C...

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