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(x-1)²+2(x-3)²=18-10x
x²-2x+1+2(x²-6x+9)+10x-18=0
x²+8x-17+2x²-12x+18=0
3x²-4x+1=0
3x²-3x-x+1=0
3x(x-1)-(x-1)=0
(x-1)(3x-1)=0
x-1=0 v 3x-1=0
x=1 v x=1/3
f)
(2x+5)²-(2x-5)²=3x²+41x-4
(2x+5+2x-5)(2x+5-2x+5)=3x²+41x-4
4x*10=3x²+41x-4
3x²+x-4=0
3x²-3x+4x-4=0
3x(x-1)+4(x-1)=0
(x-1)(3x+4)=0
x=1 v x=-4/3