Korzystamy ze wzorów skróconego mnożenia:
(x+y)²=x²+2xy+y²
(x-y)²=x²-2xy+y²
(x-y)(x+y)=x²-y²
2(x-0,3)²-4(x+0,5)²-3(x-0.1)(x+0,1)=2(x²-0,6x+0,09)-4(x²+x+0,25)-3(x²-0,01)=
=2x²-1,2x+0,18-4x²-4x-1-3x²+0,03= -5x²-5,2x-0,79
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Korzystamy ze wzorów skróconego mnożenia:
(x+y)²=x²+2xy+y²
(x-y)²=x²-2xy+y²
(x-y)(x+y)=x²-y²
2(x-0,3)²-4(x+0,5)²-3(x-0.1)(x+0,1)=2(x²-0,6x+0,09)-4(x²+x+0,25)-3(x²-0,01)=
=2x²-1,2x+0,18-4x²-4x-1-3x²+0,03= -5x²-5,2x-0,79