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X3 - 20X2 + 19X
factor out an X
X(X2 - 20X + 19)
what two factors of 19 add up to - 20?
X(X - 1)(X - 19)
============ fully factored
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19x
(20x + 3)(1x + 1)
x^2-19x+90 (x-9) (x-10)
x=-2
20x2 = 41x+9 20x2-41x-9 = 0 (5x+1)(4x-9) = 0 Therefore: x = -1/5 or x = 9/4