SOLUTION: When a number is added to its square, the result is 6. What is the number?

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Question 1147596: When a number is added to its square, the result is 6. What is the number?
Answer by ikleyn(52751) About Me  (Show Source):
You can put this solution on YOUR website!
.

n^2 + n = 6,


or, equivalently, 


n*(n+1) = 6.


There are two solutions :  n= 2  and  n= -3.    ANSWER

This problem is for mental solution, and should be solved in 4 seconds mentally.