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2014-05-25T11:37:58+03:00
X²-4x+4 -(3x-2x² -3 +2x)=3(x²-9)+25

x²-4x+4 -3x +2x² +3 -2x =3x²-27+25

3x²-9x +7 =3x²-2

-9x+7=-2
-9x=-2-7
-9x=-9
x=1
2 5 2
2014-05-25T11:40:15+03:00
X²-4x+4-(3x-2x²-3+2x)=3(x²-3x+3x-9)+25
x²-4x+4-3x+2x²+3-2x=3x²-9x+9x-27+25
3x²-9x+7=3x²-2/-3x²
-9x+7=-2/-7
-9x=-9/:-9
x=1
1 2 1