Question

giải pt :

a, \(x^2-4x-2=2\sqrt{x^3+1}\)

b, \(x^2-7x+1=4\sqrt{x^4+x^2+1}\)

c, \(3\sqrt{x^2+4x-5}+\sqrt{x-3}=\sqrt{11x^2+25+2}\)