In our modern era, digital television is a norm, and most homes have HDTVs. HDTVs are usually rectangular in shape and have a standard aspect ratio of 16:9. Please respond to the following questions.   4. Derive a formula for the diagonal of the screen as a function of the height of the screen.   There are other questions, but I am having a tough time with comprehending "as a function of".  I understand the Pythagorean theorum will be used, so I need to find the square root of l2  + w2 to find the value of the diagonal, but "as a funtion of" has me stumped

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.