Question

Dados A = 5x³+3x²-5x+8 e B = x³+2x²-x+8, calcule :

a) A+B

b) A-B

c) B-A

d) -B+A

Answer 1

a) 5x³+3x²-5x+8+x³+2x²-x+8
    6x³+5x²-6x+16

b)5x³+3x²-5x+8-(x³+2x²-x+8)
   5x³+3x²-5x+8-x³-2x²+x-8
   4x³+x²-4x

c)x³+2x²-x+8-(5x³+3x²-5x+8)
   x³+2x²-x+8-5x³-3x²+5x-8
   -4x³-x²+4x

d) Igual o b)

Answer 2

Dados A = 5x³+3x²-5x+8 e B = x³+2x²-x+8, calcule :

a) A+B = 5x³+3x²-5x+8 + x³+2x²-x+8 ==> 6x³ + 5x² - 6x + 16
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b) A-B=   5x³+3x²-5x+8-(x³+2x²-x+8) =>

5x³+3x²-5x+8 -x³-2x²+x-8 ==> 4x³ + x² - 4x
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c) B-A=  x³+2x²-x+8 - (5x³+3x²-5x+8)=>

x³+2x²-x+8-5x³-3x²+5x-8=> - 4x³ - x² + 4x
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d) - B+A ou - ( B - A) = - (x³+2x²-x+8)  - ( 5x³+3x²-5x+8) =>

x³+2x²-x+8-5x³-3x²+5x-8=> - (- 4x³ - x² + 4x) ==>  4x³ + x² - 4x