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0,4x²+9-3(0,9x²+16)+4(x²-1,44)=0,4x²+9-2,7x²-48+4x²-5,76=2x²-44,76
b)(x+5)(5-x)+3(3x+1)do kwadratu-4(x-2)do kwadratu
25-x²+3(9x²+1)-4(x²+4)=25-x²+27x²+3-4x²-16=22x²-13
c)(2a-3b)(3b+2a)-2(a-3b)do kwadratu-(2a+b)do kwadratu
4a²-9b²-2(a²+9b²)-4a²-b²=4a²-9b²-2a²-18b²-4a²-b²=-2a-28b²