1. 13-7 Using Quadratic Equations
Standards 14.0, 20.0, 23.0
Objective: Use factoring and the quadratic formula to solve equations; apply quadratic equations to physical problems.

2. #1 Solve.
A rectangular garden is 80m by 60m. Part of the garden is torn up to install a strip of lawn of equal width around the garden. The new area of the garden is 800 m2. How wide is the strip of lawn? x x x 60
60 – 2x
80 – 2x x 80

3. #1 Solve

4. #2 Solve.
The hypotenuse of a right triangle is 4 cm long. One leg is 1 cm longer than the other. Find the lengths of the legs. Round to the nearest tenth.

5. #2 Solve.

6. #3 Solve Let c = the speed of the current.
The speed of a boat in still water is 12 km/h. The boat travels 45 km upstream and 45 km downstream in a total time of 8 hours. What is the speed of the stream?
Let c = the speed of the current.

7. #3 Solve
Distance
Rate
Time
down 45
12 + c up 45
12 – c

8. #3 Solve