How do you factor and solve $x^2 – 9x = -20$ ?

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Answer 1 · 2016-08-30T15:36:14

x = 5 & 4

$x^2$ - 9x + 20 = 0
or, $x^2$ - 4x - 5x + 20 = 0
or, x (x - 4) - 5 (x - 4) = 0
or, (x - 4)(x - 5) = 0
or, x - 4 = 0, x - 5 = 0
or, x=4 & 5

How do you factor and solve x^2 – 9x = -20x^2 – 9x = -20?