Question

giải phương trình:

a, \(\sqrt{4x^2+5x+1}-2\sqrt{x^2-x+1}=9x-3\)

b, \(\sqrt{4x+1}-\sqrt{3x-2}=\dfrac{x+3}{5}\)

c, \(x^2+3x+5=\left(x+3\right).\sqrt{x^2+5}\)

d, \(\sqrt{x^4+x^2+1}+\left(x^2+1\right).\sqrt{3}=3x\sqrt{3}\)