questions on attachment!!

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- July 24th 2006, 04:36 PMLane4 ?'s Help Me Please!!!
questions on attachment!!

- July 24th 2006, 08:21 PMCaptainBlackQuote:

Originally Posted by**Lane**

The cofactor is times the determinant of the matrix obtained from by deleting the th row

and the th column of .

The question is asking for and .

,

where denotes something left to the reader to complete.

RonL - July 24th 2006, 08:56 PMSoroban
Hello, Lane1

You could help us by indicating where your difficulty lies.

Otherwise, we're not helping you ... we're just doing your homework.

Quote:

1. Find the three cofactors of the second row of the matrix.

. . . .

Cofactor of

Cofactor of

Cofactor of

Quote:

2. Find the determinant of:

. . .

Quote:

3. Use Cramer's Rule to solve (if possible) the system of equations.

. . . .

Quote:

the vertices of a triangle are given below. .Use a determinant

and the vertices of the triangle to find the area of the triangle.

. . . . .

The area of a triangle with vertices is given by:

. . .

So we have: .

I'll let*you*crank it out . . .

- July 24th 2006, 09:02 PMCaptainBlack
2. Find the determinant of:

Let's do this by expanding about the first row:

,

where is the th cofactor od

RonL