The monotone interval of function y = radical X-1 + radical x + 3 is The monotone interval of function y = radical (x-1) + radical (x + 3) is

The monotone interval of function y = radical X-1 + radical x + 3 is The monotone interval of function y = radical (x-1) + radical (x + 3) is

According to the definition of the root sign, the value range of X is
x≥1
Because the root sign (x-1) and root sign (x + 3) are increasing functions
So when x = 1, the minimum value of the function is y = 2
So the monotone interval is [2, + infinity]