Calculating expended energy in a battery

[sdoyle1]

Homework Statement

How much energy must a 42 V battery expend to fully charge a 3.62x10-6 F and a 6.11x10-6 F capacitor when they are placed in parallel?

Homework Equations

capacitor in parallel therefore total capacitance is the sum...

The Attempt at a Solution

I thought that you could use U=Vq but apparently you can't because I was getting the wrong answers.. this is the same question that I tried to do before but with different values. HELP :)

 

[rock.freak667]

When in parallel, what is the total capacitance?

How do you find the energy stored in a capacitor?

 

[sdoyle1]

Thank you so much!