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# Solve for X

+10
488
5
+1878

Solve for X

$$\begin{bmatrix} 4 && -4 && 7 \\ 8 && 2 && 1 \end{bmatrix} +X= \begin{bmatrix} -3 && 4 && 6\\ -17 && 9 && 18 \end{bmatrix}$$

Feb 7, 2017

#5
+25644
+5
Feb 10, 2017

#2
+31498
+5

Just subtract the matrix on the left from the matrix on the right.  You do this element by element.  For example the top left element will be -3 -4 = -7,  the one to its right will be 4 - (-4) = 8, and so on.

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Feb 7, 2017
#3
+25644
+10

Solve for X

$$\begin{bmatrix} 4 && -4 && 7 \\ 8 && 2 && 1 \end{bmatrix} +X= \begin{bmatrix} -3 && 4 && 6\\ -17 && 9 && 18 \end{bmatrix}$$

$$\begin{array}{|rcll|} \hline \begin{bmatrix} 4 && -4 && 7 \\ 8 && 2 && 1 \end{bmatrix} +X &=& \begin{bmatrix} -3 && 4 && 6\\ -17 && 9 && 18 \end{bmatrix} \\ X &=& \begin{bmatrix} -3 && 4 && 6\\ -17 && 9 && 18 \end{bmatrix} -\begin{bmatrix} 4 && -4 && 7 \\ 8 && 2 && 1 \end{bmatrix} \\ X &=& \begin{bmatrix} -3-4 && 4-(-4) && 6-7 \\ -17-8 && 9-2 && 18-1 \end{bmatrix} \\ \mathbf{ X } & \mathbf{=} & \mathbf{ \begin{bmatrix} -7 && 8 && -1 \\ -25 && 7 && 17 \end{bmatrix} }\\ \hline \end{array}$$

Feb 7, 2017
#4
+1878
+10

I through it is $$X=\begin{bmatrix} 7 && 8 && 4\\ -25 && 2 && 17 \end{bmatrix}$$

EighthMersennePrime  Feb 10, 2017
#5
+25644
+5