Question

Sendo A = 5x² - 7x² - 7xy + 13y² e B = 7x² - 12xy - 18y², calcule: a) A+B b) A-B​

Answer 1

A = 5x² - 7x² - 7xy + 13y²

B = 7x² - 12xy - 18y²

a.

A + B

(5x² - 7x² - 7xy + 13y²) + (7x² - 12xy - 18y²)

- 2x² - 7xy + 13y² + 7x² - 12xy - 18y²

5x² - 7xy + 13y² - 12xy - 18y²

5x² - 19xy + 13y² - 18y²

5x² - 19xy - 5y²

b.

A - B

(5x² - 7x² - 7xy + 13y²) - (7x² - 12xy - 18y²)

- 2x² - 7xy + 13y² - 7x² + 12xy + 18y²

- 9x² - 7xy + 13y² + 12xy + 18y²

- 9x² + 5xy + 13y² + 18y²

- 9x² + 5xy + 31y²