Question

caucule
(A) - 9x2 + 5y + 7x2 – 2y
(B) 10xy - 12xy + 7xy - 3xy
(C) x² - 4x2 – 2y2 + 3x² - y2
(D) 9x + 12x - 7x​

Answer 1

Resposta:

A) - 9x2 + 5y + 7x2 - 2y

- 18x + 5y + 14x -2y

-4x +3y

B) 10xy - 12xy + 7xy - 3xy

2xy

C) x² - 4x2 - 2y2 + 3x² - y²

4x² - 8x - 4y - y²

( 2x - y) × (2x + y) - 4( 2x + y)

(2x + 4) × (2x - y - 4)

D) 9x + 12x - 7x

(9 + 12 - 7)x

14x