Sederhanakan! 1.(2x + 5y - 6) + (4x - 3y + 7)=... 2.(9x² + 7x + 8y - 3x) - (x² - 2y - 4x)=....

1.
(2x + 5y - 6) + (4x -3y + 7) =
= 2x + 5y -6 + 4x -3y +7
= 6x +2y + 1

2.
(9x² + 7x + 8y -3x) - (x²- 2y- 4x) =
= 9x² + 7x + 8y - 3x - x² + 2y + 4x
= 8x² + 8x + 10 y

1.)2x + 4x + 5y - 3y - 6 + 7 = 6x + 2y +1 = 2(3x + y) + 1
2.)(9x² + 4x + 8y) - (x² - 2y -4x) = 9x² + 4x + 8y - x² + 2y + 4x
                                                   = 8x² + 8x + 10y
InsyaAllah benar