Question

dado os polinômio A=3x² + 2x - 4; B= 5x - 3 e C= 2x + 5, calcule
a)A+B+C
b)AB-BC
c)2A-2B

Answer 1

a) 3x² + 2x -4 + 5x - 3 + 2x + 5 = 3x² + 9x - 2

b) (3x² + 2x - 4) (5x - 3) - (5x - 3) (2x + 5) = (15x³ - 9x² + 10x² - 6x - 20x + 12) - (10x² +25X - 6X - 15) = (15X³ + x² - 26x + 12) - (10x² + 19x - 15) =

15x³ + x² - 26x + 12 - 10x² - 19x +15 = 15x³ - 9x² - 45x + 27

c) 2(3x² + 2x - 4) - 2(5x - 3) = 6x² + 4x - 8 - 10x + 6= 6x² - 6x - 2