What is the solution set for x in the equation below square root of x + 1 -1 = x?
Accepted Solution
A:
The notation in your question is not clear, but I presume that the equation is: √(x + 1) - 1 = x
In order to solve irrational equation, you need to separate the radicand from the rest: √(x + 1) = x + 1
Now, you need to set the condition in order to have a positive number as a radicand (you cannot have a square root of a negative number): (x + 1) ≥ 0 x ≥ -1
Once the condition is set, you can elevate everything to the second power: (√(x + 1))² = (x + 1)² x + 1 = x² + 2x + 1 x² + x = 0 x(x + 1) = 0 x = 0 and x = -1
Now that you have the solutions, check if they are relevant according to the condition you have previously found: in this case, yes, they are both greater than or equal to -1.