Matrices & Determinants
General
Grade 12

Question:

Evaluate the determinant $\begin{vmatrix} 1 & 1 & 1 \\ a & b & c \\ bc & ac & ab \end{vmatrix}$.

Step-by-Step Solution

Key Concept: General
$$\begin{vmatrix} 1 & 1 & 1 \\ a & b & c \\ bc & ac & ab \end{vmatrix} = \begin{vmatrix} 1 & 1 & 1 \\ a & b & c \\ a^2 & b^2 & c^2 \end{vmatrix} = (a-b)(b-c)(c-a)$$
Correct Answer: (a-b)(b-c)(c-a)

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