Question

notice that in first term there is 3x2 whole underroot​

Answer 1

√(3x²) + 10x -8√3=0

x√3 + 10x -8√3=0

x(√3 -10)=8√3

x=8√3/(√3 -10)

if you want to, you can rationalise the RHS terms, but not doing so is also okay.