Factor completely the polynomial. Indicate any that are not factorable using integers.a 2 - 4a + 21
A. (a - 3)(a + 7)
B. (a + 3)(a - 7)
C. (a - 3)(a - 7)
D. (a + 3)(a + 7)
E. not factorable
Answer: B
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Find the open intervals on which the function is increasing and decreasing. Identify the function's local and absolute extreme values, if any, saying where they occur.
A. increasing on (-1, 1); decreasing on (0, 6); absolute maximum at (1, 2); absolute minimum at (-1, -2) B. increasing on (-1, 1); decreasing on (-6, -1) and (1, 6); no absolute maximum; no absolute minimum C. increasing on (-1, 1); decreasing on (-6, 0); absolute maximum at (1, 2); absolute minimum at (-1, -2) D. increasing on (-1, 1); decreasing on (-6, -1) and (1, 6); absolute maximum at (1, 2); absolute minimum at (-1, -2)
Add or subtract as indicated.
- 
A. 
B. 
C. 
D. 
Perform the indicated operations and simplify the result. Leave the answer in factored form.
+ 
- 
A. 
B. 
C. 
D. 
Use the indicated row operation to change the matrix.Replace R3 by 
R3.
A. 
B. 
C. 
D. 