Question

Dados os polinomios A(x)=5x³+2x²+X e B(x)5x³+2x²-x+4, Determine o grau [A(x)-B(x)]

A) Gr=-1
B) Gr=1
C) Gr=2
D) Gr=3

Answer 1

5x³ + 2x² + x - (5x³ + 2x² - x + 4) =

5x³ + 2x² + x - 5x³ - 2x² + x - 4 =

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

2x - 4

O grau [A(x)-B(x)]  = 1

Portanto, letra B

A) Gr = -1

B) Gr = 1

C) Gr = 2

D) Gr = 3