square root

Let y² - 2y + 1 = x and √x + y = 5. The value of x + √y equals _________ (Give the answer up to three decimal places)

Let $$\,{y^2} - 2y + 1 = x$$ and $$\,\sqrt x + y = 5.\,\,$$ The value of $$\,x + \sqrt y \,\,$$ equals ________. (Given the answer up to three decimal places)

Square roots of $$-i,$$ where $$i = \sqrt { - 1} $$ are