The graph of a function is a square root function.
When you draw the standard square root function in the desmos , you will get the same square root curve as it is given in the question.
Therefore the graph of a function is a square root function.
In second part , we have to determine the x-intercept of the function.
The x-intercept of the function is that where the y-coordinate is equal to zero.
In the graph , the coordinates where y-coordinate is 0 at