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2009-12-02T17:05:16+01:00
2(x-2)² = (x-3)(x+3)-(8x- x ² -3)
2(x²-4x+4)=x²-9-8x+x²+3
2x²-8x+8=2x²-8x-6
0=-14


-3x(x+5)+(2x-1) ² = (x-3)(x+3)- (10x-13)
-3x²-15x+4x²-4x+1=x²-9-10x+13
x²-19x+1=x²-10x+4
9x=3
x=1/3

2(x-1)² = ( x+4)(x-4)- ( 1/2 x - x ² + 3)
2(x²-2x+1)=x²-16-1/2x+x²-3
2x²-4x+2=2x²-19-1/2x
-3 1/2x=-17
x=4 6/7

(x-3)² = ( x+2 ) (x-2) -(1,5x-4)
x²-6x+9=x²-4-1,5x+4
-4,5x=-9
x=2
1 5 1