x2 = x+20
x2-x-20 = 0
(x-5)(x+4) = 0
x = 5 or x = -4
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If you mean: x2+9x+20 then it is (x+4)(x+5) = 0 when factored
'20 squared' simply means 20 multiplied by itself (20 x 20). This equals 400.
The solutions are: x = 4, y = 2 and x = -4, y = -2
x2 + 9x + 20 = 0 ∴(x + 4)(x + 5) = 0 ∴x ∈ {-5, -4}
2x2 + 3x - 20 = (x + 4)(2x - 5).