Question

Considerando A = 2xy + 3xz - 4xw + 5x, B = - 2xy + 5xz - 2xw - x e C = 4xy - 3xz + x, determine A + B + C e marque a resposta correta:

A
8xy + 5xz - 6xw + 5x


B
4xy + 5xz - 6xw + 5x


C
- 2xy + 5xz + 6xw + 5x


D
- 4xy + 11xz - 6xw + 3x

Answer 1

A+B
2xy+3xz-4xw+5x+(-2xy)+5xz-2xw-x
=2xy-2xy+3xz+5xz+5x-x-4xw-2xw
=8xz+4x-6xw+C
=
8xz+4x-6xw+4xy-3xz+x
=8xz-3xz+4x+x-6xw-3xz
=5xz+5x-6xw-3xz