Monotone interval common of function f (x) = (x + 3) multiplied by absolute value X-1

When x ≥ 1, f (x) = (x + 3) (x-1) = x ^ 2 + 2x-3, f '(x) = 2x + 2, because x ≥ 1, f' (x) > 0, monotonically increasing
x

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