Answer
$(x-4)(x-5)$
Work Step by Step
$-9x+20+x^2$
$x^2-9x+20$
Factors of 20: 1 and 20, 2 and 10, 4 and 5, -1 and -20, -2 and -10, -4 and -5
$x^2-9x+20$
$(x-4)(x-5)$
$x*x+x*-5+x*-4+(-4)(-5)$
$x^2-5x-4x+20$
$x^2-9x+20$
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