Question

Obtenha m tal que f(f(m))=1, sendo f(x)=4-2x

Answer 1

$f(m) = 4 - 2m \\ f(f(m)) = f(4 - 2m) = 4 - 2(4 - 2m) = 4 - 8 + 4m = -4 + 4m \\ f(f(m)) = 4m - 4 \\ f(f(m)) = 1 \Rightarrow 4m - 4 = 1 \Rightarrow 4m = 1 + 4 = 5 \\ m = \frac{5}{4} = 1,25$