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To find the value of x, we evaluate det([B])/det([A]) as shown below:
11.5 Matrix Algebra
EXAMPLE 3 Adding and Subtracting Matrices
2 4 8
=
Suppose that
A
0
Find (a) A + B
SOLUTION
Enter the matrices into the graphing utility. For a review of this, see Section 6.3 tutorial.
Name each matrix A and B. To add matrix A and B...
1) Press MATRX. Under the NAMES menu, select 1.[A] by pressing 1 or hitting
ENTER. You should have the following on your home screen:
2) Press +.
−
3
2
=
A
6
1
−
3
=
and
B
1
2
3
(b) A - B
−
4
2
=
and
B
6
1
−
3 4 0 1
6 8 2 0
w
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