@BibianoMC@laborutunics@farman4x It's a quadratic equation. To solve it, you must first set to =0, then factor the trinomial. If you mult the second line together, you'll get your trinomial back. But since you have it in the form of two things multiplied = 0, subbing in 9 or -10 will make it true.
@OFBaseball1@0DonaldTrumpJr1 I guess Trump flunked 3rd grade. I've never heard another Pres is name calling. Trump does it every time he steps to a podium