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a)(3x-x)² =(4-x)²
9x²-6x²+x²=16-8x+x²
4x²-x²+8x-16=0
3x²+8x-16=0
a=3
b=8
c=-16
delta=b²-4ac=8²+192=64+192=256
pierwiastek z delty=16
x1=-8-16/6=-4
x2=-8+16/6=1i1/3