Concept explainers
To describe : the error.
Answer to Problem 85E
det( A ) is -7 not 7.
Error in the given data is the first element in the expansion is multiplied by 1, second is multiplied by (-1) third is multiplied by 1 in second row expansion while in Laplace formula first element is multiplied by (-1) ,second is multiplied by 1, third is multiplied by (-1) in second row expansion .
Explanation of Solution
Given information:
Formula used:
Laplace formula to compute the determinant of a 3 × 3 matrix for second row is :
Calculation:
So, according to Laplace formula,
So det( A ) is -7 not 7.
Error in the given data is the first element in the expansion is multiplied by 1, second is multiplied by (-1) third is multiplied by 1 in second row expansion while in Laplace formula first element is multiplied by (-1) ,second is multiplied by 1, third is multiplied by (-1) in second row expansion .
Chapter 7 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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