If you mean: x2+9x+20 then it is (x+4)(x+5) = 0 when factored
4, -5
(x+4)(x-5) = 0
Factor out -2: -2(x squared +11x-20). This is fully factored.
2 squared plus 2 squared equals 16 because 2 squared is 4 times 4 equals 16. Math: 4x4=16 so your answer is 16 :)!
(x + 5) (x - 4)
20 = 400
It is (2x-5)(x-4) when factored
20
'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}