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b) (x-2)(3-x)=1-(x+2)² 3x-x²-6+2x=1-(x²+4x+4) 3x-x²-6+2x=1-x²-4x-4 3x-x²+2x+x²+4x=1-4+6 9x=3/:9 x=0,3333.....
c)(3x-2)(3x+1)=(3x-2)² 9x²+3x-6x-2=9x²-12x+4 9x²+3x-6x-9x²+12x=4+2 9x=6/:9 x=1,5
d)(2x+3)²=(x+3)(x-3)+3x² 4x²+12x+9=x²-9+3x² 4x²+12x-x²-3x²=-9-9 12x=-18/:12 x=-1,5
e) (5-2x)²-(x-1)(x+2)=3(x-2)² 25-20x+4x²-(x²+2x-x-2)=3(x²-4x+4) 25-20x+4x²-x²-2x+x+2=3x²-12x+12 -20x+4x²-x²-2x+x-3x²+12x=12-25-2 -9x=-15/:(-9) x=1,666....
f) (2x-1)²+1=x²+3(x-1)(x+1) 4x²-4x+1+1=x²+3(x²-1) 4x²-4x+1+1=x²+3x²-3 4x²-4x-x²-3x²=-3-1-1 -4x=-5/:-4 x=1,25