Matrix Question

[quaint locust]

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[eternal stream]

find determinante of A and put the value for it in x

hope that helps

[steep root]

@eternal stream you sure about that

[eternal stream]

is it not?

[steep root]

?

Doesnt say to find the determinant anywhere

[eternal stream]

what can you do of a matrix without using it?

[steep root]

f(A) so sub the matrix A into the equation and find A^2-7A+6

You can square it, multiply it by 7

Subtract one from the other

Then subtract 6I

[eternal stream]

i dont think that is what the question is asking for

or he did say it

[steep root]

Doesnt say find f(det(A))

[eternal stream]

yeah

[steep root]

@civic flume what do you think

[civic flume]

You are right

[steep root]

Thanks

[civic flume]

❤️

[steep root]

@quaint locust your answer here

[quaint locust]

I am confused

How do i add a number to a matrix?

Ill put the matrix a in x²-7x+6

But how would i add a single digit "6" to it

I only know to multiply a scalar number to a matrix, not how to add a single one

[steep root]

Multiply 6 by the identity matrix

Then add it

[quaint locust]

Could you elaborate

Little bit

I get the identity matrix part

But could you explain why you specifically chose an identity matrix to do that

[eternal stream]

he means to multiply 6 with unit matrix and then add that matrix and this

[steep root]

@quaint locust well you can't add a scalar to a matrix. but you can linearly transform a scalar into a matrix by multiplying it with I

that's how it's generally done, think of it as an educated guess on how to deal with equations where scalars show up with matrices

[quaint locust]

Okay i appreciate the help

Thanks @steep root and @eternal stream

[arctic zodiac]

@quaint locust has given 1 rep to @steep root @mild sierra

[quaint locust]

+close