Cool math fractal

math image

math image

pre-algebra help lessonsalgebra help lessonsprecalculus / calculus help lessonsmath anxiety survival guidegeometry math artmath and jigsaw puzzlesCoolmath booksother math stuff
math help lessonsmath practice problemsmath gamesmath dictionarygeometry trigonometry reference area
teacher's areaparent's areaCoolmath 4 kidsSpike's Game ZoneFinance FREAKTotally Stressed OutScience Monster

Coolmath Algebra
Matrices Lesson 6 - Inverse Matrices (page 1 of 9)
---- This algebra lesson explains how to find the inverse of a matrix

math image

Now available:  Coolmath Algebra books!  Part 1, Part 2 and Part 3 covering the Algebra you need from Algebra 1 through Precalculus Algebra (Beginning Algebra through College Algebra)

other Coolmath Books:  Coolmath Precalculus Review (the math you really need to survive Calculus 1) and Math Survival Guide (How to conquer math and deal with math anxiety)

line
Graphing Calculator Scientific Calculator << a new window will open for these
line
We've now learned to add and subtract matrices... how to multiply a matrix by a scalar... and how to multiply two matrices...

So, what about division?

Well, there isn't a division process for matrices.  BUT, there IS a way to get around this little problem.  We can use something we already know about: multiplication.

Here's the scoop:

Say you need to solve this guy...

3x = 4

What do we do?  We divide both sides by 3:

3x / 3 = 4 / 3 ... x = 4 / 3

Let's take a closer look at what's going on here:

Instead of saying that we are dividing by 3, how about saying that we are multiplying by 1 / 3:

3x = 4 ... ( 1 / 3 ) times 3x = ( 1 / 3 ) times 4 ... x = 4 / 3

The result is the same, but we used multiplication instead of division.

Continued on the next page

 The printing and distribution and/or downloading of these lessons is strictly prohibited.

line
Graphing Calculator Scientific Calculator << a new window will open for these
line

.....:::::::::::::::  HELP SUPPORT COOLMATH  :::::::::::::::.....
:::::::  link to us   :::::::   advertise with us  :::::::  why we have ads  :::::::

Thanks for visiting Coolmath.com
© 1997-2010 Coolmath.com, Inc.