Here is A

Here is 2.1

And 2.7

7. Let A be the (4 x 4) coefficient matrix of the system in Example 2.6. Then A-1 is given by 68-4 -17 10 -41 25 10-6 A-1 = 17 10 5 -3 10 6-32 - Find the condition number of this matrix. Use the inequality (2.45) of Theorem 2.1 and the computer results of Example 2.7 to estimate the relative error xe xl What is the true relative error? 7. Let A be the (4 x 4) coefficient matrix of the system in Example 2.6. Then A-1 is given by 68-4 -17 10 -41 25 10-6 A-1 = 17 10 5 -3 10 6-32 - Find the condition number of this matrix. Use the inequality (2.45) of Theorem 2.1 and the computer results of Example 2.7 to estimate the relative error xe xl What is the true relative error