Question

How do you solve `5x^2 = –45x`?

Answer 1

Answer is
`x=-9`or `x=0`

Explanation:

`The` `above` `equation`
`5x^2 = -45x`
Do not divide both sides by `x`. You will lose an answer.
Instead, get both terms on one side and factor:
`5x^2+45x = 0`

now we got,
`5x(x+9) = 0`

So,

Either `5x=0` or `x+9=0`

Either `x=0` or `x=-9`.