SOLUTION: 1. What is the formula for the determinant of a 3 x 3 matrix ? A. B. C. D. 2. Solve the inequality |2x &#8722; 4| < 10. Write the solution in interval

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Question 594421: 1. What is the formula for the determinant of a 3 x 3 matrix ?
A.
B.
C.
D.


2. Solve the inequality |2x − 4| < 10. Write the solution in interval notation and graph it.
A.
B.
C.
D.





Answer by AnlytcPhil(1810)   (Show Source): You can put this solution on YOUR website!
You only get to ask two questions.  So the others were deleted:

1. What is the formula for the determinant of a 3 x 3 matrix ?
 
 = aei + bfg + cdh - ceg - bdi - afh

2. Solve the inequality |2x − 4| < 10. Write the solution in interval notation and graph it:
To remove absolute value bars with < or <, write

                              -10 < 2x - 4 < 10, and solve for x in the middle:
Add 4 to all three sides       +4       +4   +4                           
                              ------------------
                               -6 < 2x     < 14

Divide all three sides by 2    -3 <  x     <  7

Here is the graph:

                    -----------o=============================o------------
                    -6  -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10 11

Here is the interval notation, which is an abbreviation for the graph:

                                     (-3,7)
     
Edwin
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