Bao yu is completing the square to solve the polynomial equation. x^2-x-3=0 what should be her first step?

a. adding –x to both sides of the equation

b. adding –3 to both sides of the equation

c. isolating the first term, x2

d. isolating the constant, –3

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

The first few steps in solving the quadratic equation 9x2 + 49x = 22 ? 5x by completing the square are shown. 9x2 + 49x = 22 ? 5x 9x2 + 54x = 22 9(x2 + 6x) = 22 which is the best step to do next to solve the equation by completing the square? 9(x2 + 6x + 3) = 25 9(x2 + 6x + 3) = 49 9(x2 + 6x + 9) = 31 9(x2 + 6x + 9) = 103

Identify the number 127 as a rational or irrational. explain