Question

Sabendo que A = x³ -3x² + 8x – 7, B = 2x² - 10 e C = 4x³ + x -14, calcule:
a) A + B
b) A - C
c) A – B + 2C
d) – 3A + 3C

Answer 1

Resposta:

a) A + B

x³ -3x² + 8x – 7 + 2x² - 10

${x}^{3} - {x}^{2} + 8x - 17$

b) A - C

x³ -3x² + 8x – 7 - 4x³ + x -14

$- 3 {x}^{3} - 3 {x}^{2} + 9x - 21$

c) A – B + 2C

x³ -3x² + 8x – 7 - 2x² - 10 + 2.(4x³ + x -14)

${x}^{3} - 5 {x}^{2} + 8x - 17 + 8 {x}^{3} + 2x - 28 \\ 9 {x}^{3} - 5 {x}^{2} + 10x - 45$