Min knows that 79.42 cm. What would she need to do to find the area?
She could multiply 9.42 by 2.
She could multiply 9.42 by :
She could divide 9.42 by 2 to find the radius, then square the radius.
She could divide 9.42 by x to find the radius, then multiply 9.42 by the radius.

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