i need help with math can someone help me?

Question

I have to make table for this equation 1/3(x-1)^2+15

this equation is in standard form I need to change it to standard form 

and find the x-intercept 

please help me  I really appreciate that you someone going to help me 

Answer 1

To find the x-intercepts, set the function equal to zero and solve for x.