Evaluate each determinant in Exercises 1–10. ∣−7142−4∣\begin{vmatrix} -7 & 14 \\ 2 & -4 \end{vmatrix}−7214−4

Ch. 6 - Matrices and Determinants

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Blitzer 8th Edition

Ch. 6 - Matrices and Determinants

문제 5

7장, 문제 5

Evaluate each determinant in Exercises 1–10.
$\begin{vmatrix}\)-7 & 14 \\2 & -4\(\end{vmatrix}$

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Identify the given 2x2 matrix as $ \begin{bmatrix} -7 & 14 \\ 2 & -4 \end{bmatrix} $.

Recall the formula for the determinant of a 2x2 matrix $ \begin{bmatrix} a & b \\ c & d \end{bmatrix} $ is given by $ \text{det} = ad - bc $.

Substitute the values from the matrix into the formula: $ a = -7, b = 14, c = 2, d = -4 $.

Calculate the product of the diagonal elements: $ a \times d = (-7) \times (-4) $.

Calculate the product of the off-diagonal elements: $ b \times c = 14 \times 2 $, then subtract this from the first product to find the determinant.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Determinant of a 2x2 Matrix

The determinant of a 2x2 matrix [[a, b], [c, d]] is calculated as ad - bc. This scalar value helps determine properties like invertibility and area scaling in linear transformations.

Matrix Notation and Elements

Understanding matrix notation involves recognizing the position of elements: 'a' and 'b' in the first row, 'c' and 'd' in the second. Correctly identifying these values is essential for accurate determinant calculation.

Application of Determinants in Algebra

Determinants are used to solve systems of linear equations, find inverses of matrices, and analyze linear transformations. Evaluating determinants is a fundamental skill in college algebra for these applications.

Evaluate each determinant in Exercises 1–10. ∣−7142−4∣\(\begin{vmatrix}\)-7 & 14 \\2 & -4\(\end{vmatrix}\)−7214−4