Question

Sendo P (x) = 4x³ + 3x² - 5x + 6 e Q (x) = x³ + 2x² - x + 8 calcule
A) P (x) + Q (x) =
B) P (x) - Q (x) =
C P (x) - P (x ) =

Answer 1

P (x) = 4x³ + 3x² - 5x + 6 e Q (x) = x³ + 2x² - x + 8 calcule

A) P (x) + Q (x) =  4x³ + 3x² - 5x + 6 + x³ + 2x² - x + 8 => 5x³ + 5x² - 6x + 14
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B) P (x) - Q (x) =   4x³ + 3x² - 5x - ( 6 + x³ + 2x² - x + 8 )

4x³ + 3x² - 5x - 6 - x³ - 2x² + x - 8  ==> 3x³ + x² - 4x - 14 
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C P (x) - P (x ) = 4x³ + 3x² - 5x + 6 - (4x³ + 3x² - 5x + 6) 

4x³ + 3x² - 5x + 6 - 4x³ - 3x² + 5x - 6 ==>   0