Question

How do you solve `y(y+4)=45`?

Answer 1

`y={-9,5}`

Explanation:

`y(y+4)=45`

`y^2+4y-45=0`

`(y+9)(y-5)=0`

`(y+9)=0" "rarr" "y=-9`

`(y-5)=0" "rarr" "y=5`

`y={-9,5}`