Factor by grouping. Assume any variable exponents represent whole numbers.x3 - 4x2 + 2x - 8
A. (x + 4)(x2 - 2)
B. (x - 4)(x + 2)
C. (x - 4)(x2 + 2)
D. (x + 2)(x2 - 4)
Answer: C
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Find the indicated matrix.Let C = 
and D = 
. Find C - 3D.
A. 
B. 
C. 
D. 
Solve the equation by completing the square.x2 - 2x - 3 = 0
A. {-1, 3}
B. {-1, -2}
C. {-3, 1}
D. {- 
, 
}
Solve the problem and answer the question.A barge takes 4 hours to move (at a constant rate) downstream for 40 miles, helped by a current of 3 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 10 hr B. 80 hr C. 7 hr D. 4 hr
Complete the square to write the equation in the form 
+ 
= 1 or 
+ 
= 1.Determine the center, foci, and vertices of the ellipse.9x2 + y2 - 72x + 135 = 0
A. (x - 3)2 + 
= 1
center: (3, 0); foci: (3, 
), (3, -
); vertices:(3, 4), (3, -4)
B. 
+ (y - 3)2 = 1
center: (3, 0); foci: (3, 
), (3, -2
); vertices:(3, 4),
(3, -4)
C. 
+ (y - 4)2 = 1
center: (4, 0); foci: (4, 2
), (4, -2
); vertices:(4, 3), (4, -3)
D. (x - 4)2 + 
= 1
center: (4, 0); foci: (4, 2
), (4, -2
); vertices:(4, 3), (4, -3)