Solve by completing the square to obtain exact solutions.x2 + 4x + 13 = 0
A. -2 ± 
i
B. 2 ± 3i
C. -2 ± 3i
D. 1, -5
Answer: C
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Use Gauss-Jordan elimination to solve the linear system and determine whether the system has a unique solution, no solution, or infinitely many solutions. If the system has infinitely many solutions, describe the solution as an ordered triple involving variable z. x + y + z = 92x - 3y + 4z = 7
A. 
B. 
C. 
D. no solution
The vector v has initial position P and terminal point Q. Write v in the form ai + bj; that is, find its position vector.P = (1, 1); Q = (-2, -4)
A. v = -5i - 3j B. v = 5i + 3j C. v = -3i - 5j D. v = 3i + 5j
Identify the open intervals where the function is changing as requested.Decreasing
A. (2, -1) B. (2, 1) C. (1, 2) D. (-1, 2)
Use an identity to write the expression as a single trigonometric function or as a single number.4 sin 2x cos 2x
A. cos 4x
B. 
sin 16x
C. 2 sin 4x
D. cos 8x