Question

Se A = x² + 1 e B = 2x² + x + 2, determine o valor de:
a) A + B
b) - 5 . B
c) - 24 + 3B

Answer 1

A = x² + 1
b = 2 x² + x + 2
a) A + B
X² + 1 + 2 X² + X + 2 = 3 X² + X + 3 

b)-5 . B = 
-5 (2 X² + X + 2 = 

-10 X² - 5 X - 10

c)-24 + 3 .b
-24 + 3 (2 x² + x + 2 = 
-24 + 6 x² + 3 x + 6 = 
-24 + 6 + 6  x² + 3 x = 
-18 + 6 x² + 3 x =

6 x² + 3 x - 18