Question

Se A = x² + 1 e B = - 2x² + x + 2, determine o valor de:

a ) A + B

b ) A - B

c ) B - A

Answer 1

a) x² + 1 - 2x² + x + 2 = -x² + x + 3
b) x² + 1 + 2x² + x + 2 = 3x² + x + 3
c) 2x² + x + 2 - x² + 1 = x² + x + 3

Answer 2

A) A + B

(x² + 1) + (-2x² + x + 2)
x² + 1 - 2x² + x + 2
-x² + x + 3

B) A - B
(x² + 1) - (-2x² + x + 2)
x² + 1 + 2x² + x + 2
3x² + x + 3

C) B - A
(-2x² + x + 2) - (x² + 1)
-2x² + x + 2 - x² + 1
-3x² + x + 3