Find solutions by completing the square x^2-6x=7

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

When only separate discreet points are graphed it is called?

What is the radical expression that is equivalent to the expression 27 1 over 5?