Respuesta :

(9x -4) - (3x + 2)
= 9x - 4 - 3x -2
= 6x - 6

(3x^2 + 8) - (2x^2 + 1)
= 3x^2 + 8 - 2x^2 - 1
= x^2 + 7

(5x^2 + 3x - 4) - (x^2 - 6x)
= 5x^2 + 3x - 4 - x^2 + 6x
= 4x^2 + 9x - 4
the correct answer for
1 -) 6x - 6
2 -) x^2 + 7
3-) 4x^2 + 9x + 4