Question

For f(x)=3x+4, find f(2) and find x such that f(x)=17

Answer 1

$f(x)=3x+4 \\ \\ f(2) =3x+4 = 3\cdot 2+4 =6+4 =10 \\ \\ \\ f(x)=17 \\ \\17=3x+4 \ \ |-4 \\ \\3x+4-4 = 17-4\\ \\ 3x = 13 \ \ /:3 \\ \\x=\frac{13}{3}\\ \\x=4\frac{1}{3}$