math help

posted by .

Can someone explain to me the following step by step , i 've looked in websites , plus the book and i want to understand how this problem has this answer.
Problem #1

Find the inverse if it exists, for the matrix.


Answer is:

sorry the problem posted up twice

To find the multiplicative inverse, you can use this form:


The objective is to get the left side to look like the right side, and the multiplicative inverse will be on the right side when finished. Whatever operations you do to the left side, you need to do to the right side as well.

Here's a few basic row operations:
1. Any 2 rows can be interchanged.
2. Any row can be multiplied by a number other than zero.
3. Any row can be replaced by adding a multiple of another row plus that row.

If the answer is as you stated, you should end up with this:


I haven't worked this out, so I hope this will help get you started.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    Could you show me step by step how to find the inverse of this problem: log with base of 2 (x+1) Thanks! It is not clear what the problem is. You are given a function of x. Let's calli it y. Are you trying to come up with an equation …
  2. Math

    How do you work this problem step by step?
  3. Algebra

    The answer in the book however says -(5x^2-17x-9)/(x-3)(x+2) so I don't know what I am doing wrong, can you take me step by step through the problem. I have a lot of problems, but I think once I understand what I am doing wrong with …
  4. math, algebra II

    Can someone explain to me step by step how the book got to this answer i want to understand the steps....thanks Find the inverse, if it exists,for the matirx (*I used the underscore to separate the numbers within the matix) -2_1_3 …
  5. Math

    What is wrong with the following proof. You must explain your answer in words. a>3 3a>3(3) 3a-a^2>9-a^2 a(3-a)>(3-a)(3+a) a>3+a 0>3 the problem with the proof is that the fourth step needs the sign to be reverse...but …
  6. Algebra help

    f(x)=x^3-4x^2-x+4 How do I find the x-intercept for this?
  7. math

    I don't understand this calculus problem at all. can someone show me step by step?
  8. math

    I need help with this problem. If someone can do it step by step that would be great. I can't get the problem correct?
  9. Math / Linear Equations

    I was looking on a website that teaches linear algebra and it had this problem: 3x - 15 _______ =0 2x + 1 And it says the answer is: x = 5 But I don't understand how to get that answer so I hope someone can give me step by step directions …
  10. Math

    I need help solving the problem not the answer. (Multiple Choice) The steps below show the incomplete solution to find the value of x for the equation 7x + 8 − 3x = −6 + 10: Step 1: 7x + 8 − 3x = −6 + 10 Step 2: 7x + 8 − …

More Similar Questions