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this is how you do it... this is how i got this..
when you simplify you get x^2-x-20. so... -4*5=-20 and -5+4=-1. so you have to refer back to your simplified equation. :) hope i make sense
You don't really need to do all that math...
The equation is just distributed out a little bit. It started with (x-5)(x+4) and they just distributed the first one. They could have done the same the other way and the problem would have been x(x-5)+4(x-5)
the reason that i showed you that way is when you get to more complex and 3 variables to work with you are giong to have to know what you need too. it makes it less complicated. i hope this is enough advise:):)