Question

Dados A= 2x² - 8x + 7, B= x² - 5x + 7  e C = 2x – 9, calcule as expressões a seguir:
·         A + B + C
·         A – B – C

Answer 1

1)2x²-8x+7   +   x² - 5x + 7   + 2x – 9
   3x²-11x+5

2)2x²-8x+7   -   (x² - 5x + 7)   - (2x – 9)
   2x²-8x+7 -x²+5x-7  -2x+9
   x²-5x+9