If the sum of 3 numbers in AP is 15 and the sum of their square is 93 Find the number

Explanation

`a-d,a,a+d`

`a-d+a+a+d=15`

`3a=15`

`a=5`

`a-d,a,a+d`

`5-d,5,5+d`

`(5-d)^2+(5)^2+(5+d)^2=93`

`25+d^2-10d+25+25+d^2+10d=93`

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