Question

Coroana !!!!! Repede !!! Calculati folosind de calcul prescurtat !

Answer 1

(2x²+y) = (2x²)² + 2·2x·y + y² = $2x^{4}$ + 4xy + y²
(2x²-y) = (2x²)² - 2·2x·y + y² = $2x^{4}$ - 4xy + y²
(x+y)(x-y) = x² - y²

$2x^{4}$ + 4xy + y² - ($2x^{4}$ - 4xy + y²) + x² - y² =
= $2x^{4}$ + 4xy + y² - $2x^{4}$ + 4xy - y² + x² - y² =
= 4xy + 4xy + x² - y² =
= 8xy + x² -y²

Answer 2

4x⁴+4x²y+y²-4x⁴+4x²y+y²+x²-y²=8x²y-y²+x².