Question

Sendo A=6x/2-3x-8, B=5x/2+4x-3 e C=x/2-10x, determine:
a) A-B
b)B-A
c)A+B+C
d)A-(B+C)

Answer 1

A = 6x^{3} - 3x - 8 =
216x - 3x - 8 =
213x = 8 =
x = \frac{8}{213} =
x = 26,62


B = 5x^{3} + 4x - 3 =
125x + 4x - 3 =
121x - 3 =
x = - \frac{3}{121} =
x = 40,33



C = x^{3} - 10x =x - 10x =
- 9x

A = 26,62
B = 40,33
C = - 9x

Vejamos:

a) A - B
26,62 - 40,33 =
- 13,71
b) B - A
40,33 - 26,62 =
13,71


c) A + B - C
26,62 + 40,33 - 9x =
66,95 - (-9x) =
66,95 + 9x =
75,95x


d) A - (B + C)
26,62 - (40,33 + (- 9x) =
26,62 - (40,33 - 9x) =
26,62 - 31,33 =
- 4,71