Question

Dada a função f (x) = (a x + 2) determine o valor de a para que se tenha f (4) = 22

Answer 1

$f(x)=a\cdot(x)+2\\\\f(4)=4a+2\\\\4a+2=22\\4a=22-2\\4a=20\\\\a=5$

Answer 2

A=5 pois 5x4=20+2=22