Oblicz 2(x-y)*(x+y)-3(x+2)² +(x-y)² gdzie x=√2 y=√2/2 (pierwiastek z dwóch przez 2) Proszę z góry o pomoc
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2x²-2y²-3x²-12x-12+x²-2xy+y²=-(12x+2xy+y²+12)
-(12√2+2*√2*√2/2+(2√2)²+12)= -(12√2+2+4*2+12)=-22-12√2