book Maths Puzzle Numerical Ability

I need help figuring this problem out please

Use the quadratic formula to solve the question for the indicated variable.

P = IE - RI^2, for I

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i know conners age but i dont really know how to make this question an equation

Nathan has two brothers, Conner and Josh. If we add 2 to Conner�s age, it is exactly � the age of their older brother Josh, who is 12. How old is Conner?
I tried to solve it but I'm not sure if its correct. The problem is : I think of a number x. If I square it and add it to the first number I thought of the total is 42. Find the n