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## Homework Statement

The matrix A is given as:

[25 , 5]

[-150 , -30]

find, in terms of m, the expression det(A-mI). This will be in a quadratic expression in m.

## Homework Equations

det(A) = ad-bc

## The Attempt at a Solution

i have no idea how to approach this but i worked out the det(A) using the equation above to be 0. This makes this matrix singular. I dont understand what the I and the m are representing