Questions on Algebra: Real numbers, Irrational numbers, etc answered by real tutors!

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Question 153822: For what values of x is the value of each expression a real number?
1. square root of x
2. 5-square root of x
3. square root of x+3: For what values of x is the value of each expression a real number?
1. square root of x
2. 5-square root of x
3. square root of x+3
Answer by orca(336) About Me  (Show Source):
You can put this solution on YOUR website!
1)
For sqrt(x) to be a real number, x has to be greater or equal to 0.
2)
For 5 - sqrt(x) to be a real number, x has to be greater or equal to 0.
3)
For sqrt(x+3) to be a real number, x+3 has to be greater or equal to 0.
I.e., x+3 >=0
Solving the inequality for x, we have
x>=-3