Question

Sejam A = 2x

2 + 4x − 5 e B = 3x

2 − 7x + 8,

determine:

a) A + B

b) A − B

c) −A + B

d) −A − B​

Answer 1

Explicação passo-a-passo:

a) A + B = (2x² + 4x - 5) + (3x² -7x + 8)

= 5x² - 3x + 3

___________________________

b) A - B = (2x² + 4x - 5) - (3x² -7x + 8)

= -x² - 11x - 13

___________________________

c) -A + B = - (2x² + 4x - 5) + (3x² -7x + 8)

= x² - 11x + 13

___________________________

d) -A - B = - (2x² + 4x - 5) - (3x² -7x + 8)

= 5x² + 3x - 3