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2014-04-27T21:07:47+03:00
A)x^2+10x+25=x^2+14x+49
14x-10x=25-49
4x=-24
x=-6
b)2*(2+2x+4)=24
2*(2x+6)=24
2x+6=24:2
2x+6=12
2x=12-6
2x=6
x=6:2=3
c)x^2-10x+25=0
(x-5)^2=0
x-5=0
x=5

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