Solution Found!
Let A = 1 2 1 2 3 0 1 4 2 . a. If Ax = 1 2 1 , use Cramers Rule to find x2. b. Find A 1
Chapter 5, Problem 2(choose chapter or problem)
QUESTION:
Let \(A=\left[\begin{array}{lll} 1 & 2 & 1 \\ 2 & 3 & 0 \\ 1 & 4 & 2 \end{array}\right]\)
a. If \(A \mathbf{x}=\left[\begin{array}{r} 1 \\ 2 \\ -1 \end{array}\right]\), use Cramer’s Rule to find \(x_2\).
b. Find \(A^{−1}\) using cofactors.
Questions & Answers
QUESTION:
Let \(A=\left[\begin{array}{lll} 1 & 2 & 1 \\ 2 & 3 & 0 \\ 1 & 4 & 2 \end{array}\right]\)
a. If \(A \mathbf{x}=\left[\begin{array}{r} 1 \\ 2 \\ -1 \end{array}\right]\), use Cramer’s Rule to find \(x_2\).
b. Find \(A^{−1}\) using cofactors.
ANSWER:Step 1 of 3
Given 
Suppose
To find 
Let 
First, let us find the determinant of A.
