Question

dados A= 5x²+8x³+2x-1 B= 9x³+4x²-8 C= 3x²+5x+2, calcular:
A+B
A+C
B+C
A - B

Answer 1

a)  A + B
= 5x² + 8x³ + 2x - 1 + 9x³ + 4x² - 8
= 8x³ + 9x³ + 5x² + 4x² + 2x - 1 - 8

= 17x³ + 9 x² + 2x - 9

b) A + C

 = 5x² + 8x³  + 2x - 1 + 3x² + 5x + 2

=  8x³ + 8x² + 7x + 1

c) B + C

= 9x³ + 4x² - 8 + 3x² + 5x + 2

= 9x³ + 7x² + 5x - 6

d) A - B

= 5x² + 8x³ + 2x - 1 - (9x³ + 4x² - 8)
= 5x² + 8x³ + 2x - 1 - 9x³ - 4x² + 8

= - x³ + x² + 2x + 7