Determine the side length of the square with a area of 3969cm^2??

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12