Question

Dada a função f(x)=7x–8, o valor de f(3) é

Answer 1

f(x) = 7x - 8

f(3) = 7 . 3 - 8

f(3) = 21 - 8

f(3) = 13

Answer 2

$\large\boxed{\begin{array}{l} \sf{f(x) = 7x - 8} \\ \\ \sf{f(3) = 7.(3) - 8} \\ \\ \sf{f(3) = 21 - 8} \\ \\ \boxed{ \sf{f(3) = 13}}\end{array}}$