Question

Dada a função definida por f(x)=7×-8,com×real,determine o valor de f(15)

Answer 1

$\large\boxed{\begin{array}{l}\rm f(x)=7x-8\\\rm f(15)=7\cdot15-8\\\rm f(15)=105-8\\\rm f(15)=97\end{array}}$