Supposed someone tried to solve the following system of equations (presented in the attactched image) by determining the inverse of the matrix of coefficients and then using matrix multiplication with desmos. But that person was not successful. Explain what happened incorrectly and offer a suggestion to fix the mistake.

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter12: Sequences, Series And Binomial Theorem
Section12.4: Binomial Theorem
Problem 12.78TI: Find the coefficient of the x4 term of (x+2)7.
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Supposed someone tried to solve the following system of equations (presented in the attactched image) by determining the inverse of the matrix of coefficients and then using matrix multiplication with desmos. But that person was not successful.

Explain what happened incorrectly and offer a suggestion to fix the mistake.

 

6x1 + 4x2
3x1
2x2
21 + X2
5x3
4x3
10
12
-2
T
||
63
1
10
B = 12
B.A-1
2
-4
Transcribed Image Text:6x1 + 4x2 3x1 2x2 21 + X2 5x3 4x3 10 12 -2 T || 63 1 10 B = 12 B.A-1 2 -4
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