Tough Math Logical Brain Teaser

It is a tough Math Logical Brain Teaser is genius brains. In this logical brain teaser, you are shown some logical number equations. Try to find the logic used in these number equations. Apply the same logic to the last number equation to find the value of the missing number.

Can you find the missing number?

Answer of this "Tough Math Logical Brain Teaser", can be viewed by clicking on the answer button.

The Answer is 13.
If A x A = C is the given number equation, then the logical code used in these equations is as below
Let's say A x A = BD
then C = B + D

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