The sum of two numbers is 24 and the product is 140, what are the two numbers? The answer is 10 and 14, but what is the formula to find? I used a chart.

Unless you are preparing for mcq, it is best to learn how to solve ot rather than memorizing formulas. Nevertheless, if you need it, I will tell you how to derive a formula. Try yourself then. And tell me if you need further assistance. The sum is 24. So if the number are x and y, you get x+y=24. And product is 140. This tells you that x*y=140. You you have got two equations. Solve them to get a quadratic equation. Try solving the quadratic equation using the quadratic formula.and that will be the formula that you need.

Definitely it's a quadratic equation.
{ x+y=24
x*y=140
At the intersection of the X and H axis at your graph there will be a solution.