An equation and the first step in its solution are shown. Equation: x2 + 3x – 9 = 0

Step 1: x2 + 3x + h = 9 + h

What value of h is used to solve the equation by the method of completing the square?

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function.a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.