i have a question regarding characteristic equation. i need help to the first question. the formula says det(A - Lambda I) = 0 my teachers solution is lamda^2 - 4 lambda + 3 = 0 so the question is how does my teacher reach that answer

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.