x2 + 9x + 20 = 0
∴(x + 4)(x + 5) = 0
∴x ∈ {-5, -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
Simple. When a number is 'squared' it simply means it is multiplied by itself. So, '20 squared' means 20 x 20, which equals 400.
36. 4 squared is 16...16 + 20 - = 36.