Question

AJUDEM ?

Sendo A = 2x³ - 14; B = x² + 9; C = 4x + 12, calcule

a) A + B

b) A - C

c) A + B + C

d) B - C

e) A . B

Answer 1

A) (2x³ - 14) + (x² + 9)

2x³ - 14 + x² + 9

3x² - 5


B) (2x³ - 14) - (4x + 12)

2x³ - 14 - 4x - 12

2x³ - 4x - 26


C) (2x³ - 14) + (x² + 9) + (4x + 12)

2x³ - 14 + x² + 9 + 4x + 12

3x² - 4x + 7


D) (x² + 9) - (4x + 12)

x² + 9 - 4x - 12

x² - 4x - 3


E) (2x³ - 14) . (x² + 9)

(2x³) . (x² + 9) + (-14) . (x² + 9)

[(2x³. x²) + (2x³ . 9)] + [(-14 . x²) + (-14 . 9)]

[2x$x^{5}$ + 18$x^{3}$] + [-14$x^{2}$ - 36]

2$x^{5}$ + 18$x^{3}$ - 14$x^{2}$ - 36