Find the value of x for which is not defined.
For a relation to be not defined/undefined, the denominator must be equal to 0
x2 + 2x + 1 = 0
Express 2x as two numbers when you multiply you will get c (1) and when you add you will get b (2)
1 x 1 = 1 and 1 + 1 = 2 hence the number is 1
x2 + x + x + 1 = 0
x(x + 1) + 1(x + 1) = 0
(x + 1)(x + 1) = 0
When x + 1 = 0, x = -1