Question

(9x² - 5y² + 2xy) - (y² - x² - 5xy + 20)​

Answer 1

${\bigstar}$SOLUTION${\bigstar}$

➠(9x² - 5y² + 2xy) - (y² - x² - 5xy + 20)

➠9x² - 5y² + 2xy - y² + x² + 5xy -20

➠10x² -6y² + 7xy -20

Answer 2

Answer:

10x² - 6y² + 7xy - 20

Step-by-step explanation:

=》(9x² - 5y² + 2xy) - (y² - x² - 5xy +20)

=》9x² - 5y² + 2xy - y² + x² + 5xy - 20

=》9x² + x² - 5y² - y² + 5xy + 2xy - 20

=》10x² - 6y² + 7xy - 20

Done....