Question

(3x elevado a 2 -5x+2) - ( x elevadoa 2 + 6x -4)+ ( 5x -7 )

Answer 1

$(3 {x}^{2} - 5x + 2) \\ - ( {x}^{2} + 6x - 4)) + (5x-7) =$

$= 2 {x}^{2} - 6x - 1$