Question

05. Dada a função f(x) = 49x. O valor de f(½) é:

A)7
B)6
C)5
D)8
E)9

Answer 1

Explicação passo-a-passo:

$\sf f(x)=49^x$

=> Para $\sf x=\dfrac{1}{2}$:

$\sf f(x)=49^x$

$\sf f\Big(\dfrac{1}{2}\Big)=49^{\frac{1}{2}}$

$\sf f\Big(\dfrac{1}{2}\Big)=\sqrt[2]{49^1}$

$\sf f\Big(\dfrac{1}{2}\Big)=\sqrt[2]{49}$

$\sf f\Big(\dfrac{1}{2}\Big)=\sqrt[2]{7^2}$

$\sf \red{f\Big(\dfrac{1}{2}\Big)=7}$

Letra A