Question

How do you solve `5x^2+10x-15`?

Answer 1

`x=1` or `x=-3`

Explanation:

We have
`5x^2+10x-15=0`
Dividing by
`5`
`x^2+2x-5=0`
By the quadratic formula we get
`x_{1,2}=-1pm sqrt(4)`
so
`x=1`
or
`x=-3`