Question

para A=x² -2xy+4y² e B=x²+2xy+4y²

determine:

A+B           

A-B

Answer 1

A+B=x^2-2xy+4y^2+x^2+2xy+4y^2
corta -2xy e +2xy
A+B=2x^2+8y^2

A-B= x^2-2xy+4y^2-x^2+2xy+4y^2
corta -2xy e +2xy e tbm x^2 e -x^2
A-B=8y^2

Answer 2

A= x² -2xy+4y² e B= x²+2xy+4y²


A+B = x² -2xy+4y² + x²+2xy+4y² ==>  2x² + 8y²        


A-B= x² -2xy+4y² - x² - 2xy - 4y² ==> - 4xy