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2x²+(x+5)²−2(x+7)²=2(3x−72,5)+(x−6)²
2x²+x²+10x+25-2(x²+14x+49)=6x-145+x²-12x+36
3x²+10x+25-2x²-28x-98=-6x-19+x²
x²-x²-18x+6x=-19+73
-12x=54 /:(-12)
x=-4,5
b)
(x+3)²−(x−5)²=16(x−1)
x²+6x+9-x²+10x-25=16x-16
16x-16x=-16+16
0=0
c)
(x−3)(x−2)(x+2)=(x−1)³+6
(x-3)(x²-4)=x³-3x²+3x-1+6
x³-4x-3x²+12=x³-3x²+3x+5
-4x-3x=5-12
-7x=-7 /:(-7)
x=1