Question

How do you factor the expression `5x^2+8x-21`?

Answer 1

`=>(x+3)5x-7)`

Explanation:

`5xx21=5xx3xx7=15xx7`
15-7=8
`5x^2+8x-21`
`=>5x^2+15x-7x-21`
`=>5x(x+3)-7(x+3)`
`=>(x+3)5x-7)`