You must use quadratic formula for each.
The term in front of the
is the "a" value in the quadratic formula. The term in front of the 
is the "b" value. And the constant term (no x's) is the "c" value. Now you must simply substitute these values into the quadratic formula for each question.
1.)
and 
2.)
and 
3.)
and 
4.)
and 
Hope this helps!
The term in front of the
1.)
2.)
3.)
4.)
Hope this helps!