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b) resolver el T.C.P., 2*(X²-10X+25)-(2X²+3X+50) = -23x, rpta
c) prop. distributiva, 10x²+15x-8x-12-5 = 10x²+7x-17,rpta
d) prop. distributiva, 3x²+15-x²-120 = 2x²-105, rpta
e) diferencia de cuadrados,(x+3)²-x²-(x-3)² = (x+3)²-(x-3)²-x²
=(x+3-(x-3))*(x+3+x-3)-x² = (6)*(2x)-x² = 12x-x², rpta.