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Chapter 9: Q. 112 E (page 886)
Solve the equation by completing the square and explain all your steps.
The solution is
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The distance between opposite corners of a rectangular field is four more than the width of the field. The length of the field is twice its width. Find the distance between the opposite corners. Round to the nearest tenth.
A triangle with area 45 square inches has a height that is two less than four times the base Find the base and height of the triangle.
A rectangular piece of plywood has a diagonal which measures two feet more than the width. The length of the plywood is twice the width. What is the length of the plywood's diagonal? Round to the nearest tenth.
The couple took a small airplane for a quick flight up to the wine country for a romantic dinner and then returned home. The plane flew a total of hours and each way the trip was miles. If the plane was flying atmph, what was the speed of the wind that affected the plane.
A cell phone company estimates that by charging x dollars each for a certain cell phone, they can sell cell phones per day. Use the quadratic function to find the revenue received when the selling price of a cell phone is x. Find the selling price that will give them the maximum revenue, and then find the amount of the maximum revenue.
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