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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.

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1 Answer 1

7
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Answer :

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Description :

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

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  • $\begingroup$ Seems pretty arbitrary. Why isn't it (6+9)² + 6² = 261? Just because two sides square the bottom number doesn't mean the top and bottom should square the number to the right. $\endgroup$
    – Octopus
    Dec 12, 2018 at 17:52

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