Question

Sendo A= 3x² + 7x, B = -4x² +5x -2 e C= 6x+1 determine A+B-C

Answer 1

A + B - C =
3x² + 7x + ( - 4x² + 5x - 2) - ( 6¨x + 1 ) =
3x² + 7x - 4x² + 5x - 2 - 6x - 1=
3x² - 4x² + 7x + 5x - 2 - 1 =
- x² + 12x - 3