Question

Yasin performs the elementary row operation represented by R2 - ½ R1 on matrix A.

Answer 1

THE CORRECT ANSWER IS

-8 -9/2 12

-6 -3 12

Explanation:

I tried 4,3,0,-8,-9/2,12 on the quiz and it was incorrect. The correct answer is

-8 -9/2 12

-6 -3 12

Answer 2

We are given a matrix of

`\begin{bmatrix}{4} & {3} & {0} \\ {-6} & {-3} & {12} \\ {} & {} & \end{bmatrix}`

Yasin performs R2 - 1/2R1

The second row and column will be

For the first row

-6 - 1/2(4)

-6 - 2

= -8

For the second row

-3 - 1/2(3)

= -3 -3/2

= -2 * 3 / 1 - 3 x 2 / 2 / 2

= -6 - 3 / 2

= -9/2

Third row

12 - 1/2(0)

= 12 - 0

12

The new matrix is

`\begin{bmatrix}{4} & {3} & {0} \\ {-8} & {-(9)/(2)} & {12} \\ {} & {} & {}\end{bmatrix}`