(x+4)(x-5) = 0
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If you mean: x2+9x+20 then it is (x+4)(x+5) = 0 when factored
x squared -2x-3 equals 0 is the same as (x + 1)(x - 3) = 0
'20 squared' simply means 20 multiplied by itself (20 x 20). This equals 400.
63
(x - 6)(x - 2)