I am having some trouble with this problem. I know the answer is 7.

This is the problem...

The radius of a large pizza is 1in. less then twice the radius of a small pizza.The difference between the areas of the pizzas is 33pi in^2.Find the radius of the large pizza.

So this must be a quadratic equation.

This is the part I don't get. Should it be like this...

-33pi in^2 + 2r -1=0

Sorry couldn't find the symbol for pie. But would I multiply the -33 first? Or is my formula completely wrong.

Or maybe putting the 33 on 2 sets of formulas. One that represents the small and one the large? Then subtracting the difference? Just need a shove in the right direction.