13-7 Using Quadratic Equations

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A quadratic equation is written in the Standard Form,

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Presentation transcript:

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.

#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

#1 Solve

#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.

#2 Solve.

#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.

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

#3 Solve