9x & # 178; = 64 to solve the equation

This is very simple! X = 8 / 3

Solution equation: 9x & # 178; = 100

9x²=100
x²=100/9
x=-+10/3
Did you learn imaginary numbers or something=
There seems to be an imaginary number

9x²-5=3
9x^2=8
x^2=8/9
X = ± (2 radical 2) / 3