Question

Calcule [(x + y)² - (x² + y²)]²

Answer 1

Resposta:

[(x + y)² - (x² + y²)]²

[x²+2xy+y²-x²-y²]²

= (2xy)²  = 4x²y²

Answer 2

[(x+y)²-(x²+y²)]²=

(x²+2xy+y²-x²-y²)²=

(x²-x²+y²-y²+2xy)²=

(2xy)²=

4x²y²