Cofactor: Definition & Formula


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What is the first step towards calculating the cofactor of an element?

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1. How are signs assigned to the cofactor of an element?


When calculating the cofactor of 3 from the given matrix, which new matrix would be used to calculate the determinant?

1 7 3
2 5 9
8 4 0

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About This Quiz & Worksheet

Use this quiz to make sure you know how to calculate a cofactor. Questions will ask you to pick the correct answer and to solve problems involving cofactors.

Quiz & Worksheet Goals

Demonstrate your knowledge of:

  • The steps for calculating a cofactor
  • Signs assigned to a cofactor
  • Using a matrix to solve cofactor problems

Skills Practiced

You will also strengthen these abilities:

  • Reading comprehension - ensure that you draw the most important information from the related lesson on cofactors
  • Problem solving - use acquired knowledge to solve practice problems that involve calculating cofactors
  • Knowledge application - use your knowledge to answer questions about calculating the determinant

Additional Learning

Learn as much as possible about cofactors by studying the lesson entitled Cofactor: Definition & Function. Some of the information covered by this lesson includes:

  • The role of a matrix in cofactor calculations
  • How to find the cofactor of a matrix
  • Uses for the cofactor of a matrix and the function of transposing