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# Matrix Operations - Practice #2 (Grades 11-12)

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## Matrix Operations - Practice #2

1.
If the matrix $[[2,9,8],[0,3,4],[1,11,3]]$ is multiplied by the scalar 5, what is the result?
1. $[[7,14,13],[5,8,9],[6,16,8]]$
2. $[[10,45,40],[0,15,20],[5,55,15]]$
3. $[[3,4,1],[11,3,2],[9,8,0]]$
4. $[[10,0,5],[45,15,55],[40,20,15]]$
2.
Evaluate. $[(2,-3), (-4,2)] - [(-1,-5), (-3,2)]$
1. $[(3,2),(-7,4)]$
2. $[(-3,2),(-7,4)]$
3. $[(3,2),(-1,0)]$
4. None of the above
3.
Evaluate. $[[1,2],[3,4]]+[[1,2],[3,4]]$
1. $[[2,4],[6,8]]$
2. $[[2,8],[6,4]]$
3. $[[8,2],[6,4]]$
4.
Evaluate, if possible. $[[-5,7],[6,8]] - [[4,0,-2],[9,0,1]]$
1. $[[-9,7],[-3,8]]$
2. $[[13,-7],[3,-8]]$
3. $[[-9,7,4],[-3,8,-13]]$
4. Impossible
5.
Evaluate: $([(-13,-20),(18,-4)]-[(0,9),(-19,-20)]) + [(-16,5),(7,-6)]$
1. $[(29,-24),(44,-10)]$
2. $[(-13,24),(-10,44)]$
3. $[(-29,-24),(44,10)]$
4. None of the above
6.
Evaluate: $3[[8],[0],[-3]]-4[[2],[2],[10]]$
1. $"Impossible"$
2. $[[16],[-8],[-49]]$
3. $[[-49],[-8],[16]]$
4. $[[16,-8,-49]]$
7.
Multiply the following.

$[(0,2),(-2,-5)] * [(6,-6),(3,0)]$
1. Undefined
2. $[(0,6),(-27,12)]$
3. $[(6,0),(-27,12)]$
4. None of the above
8.
Multiply the following.

$[(6),(-3)] * [( -5, 4)]$
1. Undefined
2. $[(-30,24),(15,-12)]$
3. $[(-30, -12)]$
4. None of the above
9.
Find the inverse of the matrix $[[2,5],[1,6]]$.
1. $[[42,-35],[-7,14]]$
2. $[[6/17,-5/17],[-1/17,2/17]]$
3. $[[2/7,5/7],[1/7,6/7]]$
4. $[[6/7,-5/7],[-1/7,2/7]]$
10.
Find the inverse of the matrix $[[0,6],[2,8]]$.
1. $[[4/6,2/4],[2/12,6/0]]$
2. $[[-2/3,1/2],[1/6,0]]$
3. $[[0,1/2],[1/6,2/3]]$
4. $[[96,-72],[-24,0]]$
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