Question

35=1/2n(n-3)?

solve setting all terms to zero

Answer 1

`n=10, n=-7`

Explanation:

`35=1/2n(n-3)`
`70= n^2-3n`
`0= n^2-3n-70`
`n^2-3n-70=0`

`n-10=0`
`n=10`

`n+7=0`
`n=-7`