need help with
f(x)=x^2+3x-5, find the value of f(3)
f(x)=2x^2+4x^2, find the value of f(-3)
Put in -3 wherever there is an 'x' and calculate the result....
Need more help than that?
As EP said, substitute \(x=3\) and \(x=-3\) into your equations, and solve from there.
You are very welcome!