Find the values of `x` for which the functions `f(x)=3x^2-1` and `g(x)=3+x` are equal

Explanation

Given, `f(x)=g(x)`

`3x^2-1=3+x`

`3x^2-x-4=0`

`x=-1` or `x=frac{4}{3}`

Hence the set of values of `x` for which the given functions are equal is `{-1, frac{4}{3}}`