Determine the roots of the following. Simplified radical form.

A)

Then i used the quad formula. My only question is, in the above second line do i distribute the - to the +4x? Or do i keep it positive? I went and made it -4x to get the below answer.

and then if its not any trouble

7. The quadratic function has no x-intercepts but the zeros of the function are . Determine the values of b and c.Show all work.I don't know whats going on here so explain if you feel like it