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Key Quiz 8.2
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1
Find the zeros of y = x2 - 14x + 24 .
A)−2 and −12
B)2 and 12
C)3 and 8
D)4 and 6
2
Find the maximum or minimum of y = -2x2 - 8x -11 .
A)(2, −3)
B)(−2, 3)
C)(−2, −3)
D)(0, −11)
3
Find the maximum area, in square centimeters, of the rectangle shown:
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A)24 cm2
B)48 cm2
C)96 cm2
D)144 cm2
4
The weekly profit earned by an Internet café can be represented by the function P = -15c2 + 1650c - 43025 , where P is weekly profit in $ and c is the number of the customers who use the café during the week. Find the number of customers the café must attract to realize the maximum profit.
A)15 customers
B)42 customers
C)55 customers
D)68 customers
5
An architect builds a ceremonial archway for his garden which can be modeled by the equation y = -x2 + 16 , where x and y represent horizontal and vertical distances (respectively) measured in metres.

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How far apart are the "feet" of the archway?
A)2 m
B)4 m
C)8 m
D)16 m





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