Solve the equation by completing the square.x2 = 7 - 4x
A. {-1 ± 
}
B. {-2 ± 
}
C. {2 + 
}
D. {-2 ± 2
}
Answer: B
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Solve the problem.A company makes a very durable product. It sells 20,000 in the first year, but will have diminishing sales due to the product's durability, so that each year it can expect to sell only seventy-five percent of the quantity it will have sold the year before. How many products can the company expect to eventually sell?
A. 26,667 products B. 40,000 products C. 80,000 products D. 35,000 products
Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them.-3x - y - 9z = -21 2x + 9y - 4z = 79 6x - 2y + z = -11
A. Inconsistent B. x = 1, y = 1, z = 9 C. Unlimited: x = 1, y = 9, z = 1, x = 1, y = 1, z = 9 D. x = 1, y = 9, z = 1
Find the integral. 
A. 18 ln 
+ C
B. 
ln 
+ C
C. 
ln 
+ C
D. 19 ln 
+ C
Use a graphing utility to graph the inequality.2x + y - 3 ? 0
A. 
B. 
C. 
D. 