Question

3. dada a função f(x) = -3x-5, determine f(5)+f(-2)/3f(3)

Answer 1

Resposta:

$f(x) = -3x-5$

$f(5) = -\,3\times 5 -\, 5 = -\, 15 -\,5 = -\,20$

$f(-\,2) = -\, 3 \times (-2) -\, 5 = +\, 6 -\, 5 = 1$

$f(3) = -\,3 \times 3 -\, 5 = -\, 9 -\, 5 = -\,14$

$f(5) + \frac{f(-\,2)}{3\times f(3)}$ $= -\, 20 + \frac{1}{3\times(-\,14)} = -\, 20 -\, \frac{1}{42} = \frac{-\,840 -\, 1}{42} = \frac{-\,841}{42}$