Write in Standard Form -13-5x=-5x^2

$- 13 - 5 x = - 5 x^{2}$

Add $5 x^{2}$ to both sides of the equation.

$- 13 - 5 x + 5 x^{2} = 0$

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

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

Move $- 13$ .

$- 5 x + 5 x^{2} - 13 = 0$

Reorder $- 5 x$ and $5 x^{2}$ .

$5 x^{2} - 5 x - 13 = 0$