The frame will be cut out of a piece of steel, and to keep the weight down, the final area should be 28 cm when: x is about −9.3 or 0.8 The negative value of x make no sense, so the answer is: x = 0.8 cm (approx.) There are two speeds to think about: the speed the boat makes in the water, and the speed relative to the land: We can turn those speeds into times using: time = distance / speed (to travel 8 km at 4 km/h takes 8/4 = 2 hours, right?
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Note that the second value could have been gotten by changing the sign on the extraneous solution.
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Comments Solving Problem Involving Quadratic Equation
Solving Word Problems Involving Quadratic Equations
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