# Which number will replace the question mark

Here is a picture of a square. From the square, your task is to find out what number should replace the question mark and find a formula of it.

1. $(7 + 2)^2 + 7^2 = 130$
2. $(4 + 3)^2 + 4^2 = 65$
3. $(8 + 5)^2 + 8^2 = 233$
4. $(9 + 6)^2 + 9^2 = 306$