Solve the following quadratic by completing the square.
f(x) = x2 + 2x – 12
x = [?] =)
Steps to Remember
1. Set the y-value equal to 0.
2. Subtract the constant term from both sides.
3. Add ()2 to both sides (to complete the square).
4. Factor (write as a perfect square).
5. Solve for x like normal.

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)