Write in Standard Form (2x^2)/5+(5x)/4=3

$\frac{2 x^{2}}{5} + \frac{5 x}{4} = 3$

Subtract $3$ from both sides of the equation.

$\frac{2 x^{2}}{5} + \frac{5 x}{4} - 3 = 0$

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

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

Reorder terms.

$\frac{2}{5} x^{2} + \frac{5}{4} x - 3 = 0$