Question 306321
When you found f(2) you got it right, but it's not equal to 2. Look!
{{{f(x) = 3x^2}}} Subsitute x = 2.
{{{f(2) = 3(2)^2}}}
{{{f(2) = 3*4}}}
{{{highlight(f(2) = 12)}}}
Notice that it's f(2) = 12 and not 2 = 12!