Question

Se f(x) = $\frac{3x+1}{x-1}$ determine $\frac{5f(-1)-2f(0)+3f(5)}{7}$

Qual a resposta?

a) -324/19
b) -263/98
c) 259/98
d) 0
e) 324/19

Answer 1

$se \: f( - 1) = \frac{3( - 1) + 1}{- 1 - 1} = 1 \: e \: f(0) = \frac{3 \times 0 + 1}{0 - 1} = - 1 \: e \: f(5) = \frac{3 \times 5 + 1}{5 - 1} = 4 \: entao \: \frac{5f( - 1) - 2f(0) + 3f(5)}{7} = \frac{5 \times 1 - 2 \times ( - 1) + 3 \times 4}{7} = \frac{19}{7}$