Question

1. Find 5A-3B.
A=[6 -5 8], B=[7 5 -6]
[5 -4 3] [4 3 -4]

2. Solve the matrix equation.
[3 -1] - x=[-2 3]
[2 5] [1 -6]

3. Given A=[1 -1 2] and B=[-1 -3 2],
[3 0 5] [2 4 5]
[0 2 -2]
Find AB.

4. What is the inverse of [-100 -25]?
[-5 -6]

Answer 1

wolframalpha can be a great resource here. Enter your matrix as a set of rows. For #1, you'd enter

{{6,-5,8},{5,-4,3}}-{{7,5,-6},{4,3,-4}}
= {{-1,-10,14},{1,-7,7}}

for inverse, just type inverse {...}

Answer 2

Ayo how tf is this still not answered