Question

2) Efetue as seguintes subtrações .

a) ( 5x² - 4x + 7 ) - ( 3x² + 7x - 1)

b) ( 6x² - 6x + 9 ) - ( 3x² + 8x -2 )

c) ( 4x – y - 1 ) - ( 9x + y + 3 ) =

Answer 1

a) ( 5x² - 4x + 7 ) - ( 3x² + 7x - 1)

5x² - 4x + 7 - 3x² - 7x + 1

5x² - 3x² - 4x - 7x + 7 + 1

2x² - 11x + 8

b) ( 6x² - 6x + 9 ) - ( 3x² + 8x -2 )

6x² - 6x + 9 - 3x² - 8x + 2

6x² - 3x² - 6x - 8x + 9 + 2

3x² - 14x + 11

c) ( 4x – y - 1 ) - ( 9x + y + 3 ) =

4x - y - 1 - 9x - y - 3

4x - 9x - y - y - 1 - 3

- 5x - 2y - 4