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A sporting goods store sells backpacks made of three different materials (canvas, nylon, or leather). Each backpack comes in one of three different colors (green, black, or blue). How many different
types of backpacks are there?A. 12B. 9C. 6D. 3?
The answer is B. 9
Expert answered|dennis003|Points 295|
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Asked 7/13/2012 6:53:15 PM
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Updated 178 days ago|3/29/2014 9:57:02 AM
1 Answer/Comment
x^2 - 8x - 4 = 0; a = 1, b = -8, c = -4
x = [-b +/- sqrt(b^2 - 4ac)]/2a
= [-(-8) +/- sqrt((-8)^2 - 4(1)(-4)]/2(1)
= (8 +/- 4 sqrt 5)/2
= 4 +/- 2 sqrt 5
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Use the quadratic formula to solve the quadratic equation x2 - 8x - 4 = 0.
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