Is there a good way to always know how to split the middle term of a quadratic equation like x^2-9x+20=0?
It turns out that -5x and -4x "works" but is there a better way to split the term that is less tedious?
I see! Negative 4 and 5 equal 9 when added, and 20 when multiplied.
There are a few cases (like ax^2 + bx + c) where it is not so obvious where to split the middle term. That is especially where I get stumped, since c does not always equal the product of the "split" term.
Thats actually what I meant to ask about.