Respuestas

2013-11-18T17:10:29+01:00
A. (x^2-4)(2x^3-1)=(2x^5-x^2-8x^3+4)=2x^5-8x^3-x^2+4
b. (x^4)(9xy^2+2y)=(9x^5y^2+2x^4y)
c. (x^2+xy-y^2)-(3y^2+2y-5) = x^2+xy-4y^2-2y+5
d. (r-t)(rt+t^2)=r^2t+rt^2-rt^2-t^3=-t^3+r^2t=t(r^2-t^2)= t(r+t)(r-t)