If 6 + 2 = 40 , 4 + 3 = 25 then 7 + 1 = ????

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If 6 + 2 = 40
4 + 3 = 25
6 + 6 = 72
5 + 10 = 125
then 7 + 1 = ????

Solve it if you can.. :)

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The logic is that we have take the squares of the two numbers and add them.
6² + 2² = 40.
4² + 3² = 25.
and so on.
Hence 7 + 1 = 7² + 1² = 49 + 1 = 50
Answer is 50.