Question

6) O resultado de (4x2 - 5x + 2) + (–5x2 + 4x - 7) é:
a) ( )+ x2 – 1.
b) ( )– x2 – 5.
c) ( )x2 + x.
d) ( )– x2 –x –5.
e) ( )2x2 – 10.

Answer 1

Letra D

(4x2 - 5x + 2) + (-5x2 + 4x - 7)

4x2 - 5x2 - 5x + 4x + 2 - 7

-x2 - x - 5

Answer 2

Oie, Td Bom?!

■ Resposta: Opção D.

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

$= 4x {}^{2} - 5x + 2 - 5x {}^{2} + 4x - 7$

$= - x {}^{2} - 5x + 2 + 4x - 7$

$= - x{}^{2} - x - 5$

Att. Makaveli1996