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M=(X-3)(X-2)-(X-6)(X+1)M=X²-5X+6-(X²-5X-6)M=X²-5X+6-X²+5X+6M=12
M=(x-3)(x+2)+(x+5)(x-4)+26
M=x2+(-3+2)x+(-3)(2)+x2+(5-4)x+(5)(-4)+26
M=x2-x-6+x2+x-20+26
M=2x2
Por sea caso el x2 es x al cuadrado.