exam Maths Puzzle Numerical Ability

Find two consecutive integers such that the sum of their squares is 5. How do I solve this problem?

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exam Other Question

find the perimter of the triangle :
4 is one side and another side is 5square-3 square and the last side is 5 square+ 3square.

Thanks you determine if the function {13,0}, {10,-9}, {9,-10}, is invertible and what is its inverse. thank you