You can solve quadratic equations with the p-q formula. Swedish National Test
Formula Collection
I hope you know that x^2 is the same as x²? Otherwise check "Skriva
Ma på dator"
(there is also described how you can write characters like ^ =
* / < > ( ) with a keyboard)

-5x^{2}
- 4x = - 9 is not in the right form: x² + px + q=0, What would make the x²
term not have - 5 as coefficient?