Use a Graphing Calculator to Find the Matrix Product And/or $\mathrm{AB}$

question 79

Multiple Choice

Use a graphing calculator to find the matrix product and/or sum.
-Find $\mathrm{AB}$ .
$$A=\left[\begin{array}{rrrr}18 & 14 & 18 & 18 \\30 & 5 & 7 & 2 \\11 & 3 & 2 & 1 \\5 & 32 & 5 & 7\end{array}\right] B=\left[\begin{array}{rrr}18 & 5 & 3 \\18 & 8 & 12 \\7 & 4 & 2 \\21 & 15 & 13\end{array}\right]$$

• A) \( \left[\begin{array}{rrrr}468 & 364 & 468 & 468 \\ 1140 & 190 & 266 & 76 \\ 143 & 39 & 26 & 13 \\ 245 & 1568 & 245 & 343\end{array}\right] \)
• B) \( \left[\begin{array}{rrr}1224 & 340 & 134 \\ 792 & 352 & 528 \\ 119 & 68 & 34 \\ 1029 & 735 & 637\end{array}\right] \)
• C) \( \left[\begin{array}{rrr}1080 & 544 & 492 \\ 721 & 248 & 190 \\ 287 & 102 & 86 \\ 848 & 406 & 500\end{array}\right] \)
• D) Does not exist

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