Question

${ x}^{2} + 90x - 1800 = 0$

Answer 1

x= -45+15√17
and -45-15√17 take a look at picture.
as -1800 can't be multiple of 90's split so direct formula would be appliied.

Answer 2

Refer to the attached image please

First we will find it's discriminant
After finding so, we get real roots
Then after applying quadratic formula we get the answer