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Question: The following equation has one or two real solutions when I solve in RealDomain?

Question:The following equation has one or two real solutions when I solve in RealDomain?

toandhsp 300 Maple 17
solve realdomain
June 23 2014
0

I want to solve the equation sqrt(x) + sqrt(1 - x^2) = sqrt(2 - 3*x - 4*x^2) in RealDomain. I tried

RealDomain:-solve(sqrt(x) + sqrt(1 - x^2) = sqrt(2 - 3*x - 4*x^2),x);

And I got one solution. But, at here 

At here http://mathematica.stackexchange.com/questions/51316/how-can-i-get-the-exact-real-solution-of-this-equation 

they said the given equation has two real solutions. How must I understand?
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