Question

1²+2²+2²=3²
2²+3²+6²=7²
3²+4²+12²=13²
4²+5²+_²=21²
5²+_²+30²=30

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Answer 1

Answer:

Mark as branliest

Step-by-step explanation:

it can observed as

[ a²+a+1²+ab²=ab²+1 ]

so,

4²+5²+20²=21

5²+6²+30²=31²