Respuestas

2012-09-12T15:25:18+02:00

(x^2-3a)(x^2-5a)=(x^2)^2+(-3a-5a)x^2+15a^2

=x^4-8ax^2+15a^2

 

(1/2x+5y)(1/2x-8y)=x^2/4-(3/2)*x*y-40y^2