Question

dada a funçao f (x)=rais de2x+1 determine o valor de f(4)

Answer 1

Simples...

$f(x) = \sqrt{2x + 2 } \\ f(4) = \sqrt{2 \times 4 + 1} \\ f(4) = \sqrt{9} \\ f(4) = 3$
prontinho...