Write in Standard Form 9x=3x^2

$9 x = 3 x^{2}$

Subtract $3 x^{2}$ from both sides of the equation.

$9 x - 3 x^{2} = 0$

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$a x^{2} + b x + c = 0$

Reorder $9 x$ and $- 3 x^{2}$ .

$- 3 x^{2} + 9 x = 0$