(1-2x)²+(3+x)²=13
1-4x+4x²+9+6x+x²=13
-4x+4x²+6x+x²=13-1-9
2x+5x²=3
x+5x²=3/2
x+5x²=1,5
x+5x=√1,5
6x=√1,5
x=√1,5/6
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(1-2x)²+(3+x)²=13
1-4x+4x²+9+6x+x²=13
-4x+4x²+6x+x²=13-1-9
2x+5x²=3
x+5x²=3/2
x+5x²=1,5
x+5x=√1,5
6x=√1,5
x=√1,5/6