The sum of a number and 11 can be represented as x + 11, where x is the unknown number. This expression denotes adding 11 to the unknown number. If you know the value of x, you can simply add 11 to find the sum. If x is unknown, the expression x + 11 remains as an algebraic representation of the sum.
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When the sum of a number plus 3 is squared, it is 11 more than the sum of the number plus 2 when squared.
2n+13
3
4
1 + 1 = 2 The sum of the digits is therefore 2.