Me plz for branliest
question is picture plz show working out

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 answer is 109 times per second