Question

Calculati:


(x-2y)la patrat =
(a-5b)la patrat=
(x-3y)la patrat=
(a-3b)*(a+3b)=

Answer 1

(x-2y)^2=x^2+2*x*2y+(2y)^2=x^2-4xy+y^2 ;
(a-5b)^2= a^2-10ab+25b^2 ;
(x-3y)^2=x^2-6xy+9y^2 ;
(a-3b)(a+3b)=a^2 - 9b^2 ;