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Hello!
The number = x
SO:
(x + 2)² = 9
x² + 4x - 5 = 0
(x - 1)(x + 5) = 0
x - 1 = 0 x + 5 = 0
x = 1 x = -5
it's a negative number, so it's -5.Verification:
-5 + 2 = -3
-3² = 9