Question

Dada a função f(x)$-\frac{x}{2}$+2, determine:

(A) f(-1)=
(B) f($\frac{1}{2}$)=

Answer 1

(A)

$f( - 1) = - (\frac{ - 1}{2} ) + 2 = \frac{1}{2} + 2 = \frac{1}{2} + \frac{4}{2} = \\ = \frac{5}{2}$

(B)

$f( \frac{1}{2} ) = - \frac{ \frac{1}{2} }{2} + 2 = - \frac{1}{2} \times \frac{1}{2} + 2 = \\ = - \frac{1}{4} + \frac{8}{4} = \frac{ - 1 + 8}{4} = \frac{7}{4}$