# Math Help - Matrix equation

1. ## Matrix equation

Picture say all ik its easy but im stuck somehow:/

2. ## Re: Matrix equation

You can solve it with co factor expansion since we know that the determinant is going to be zero.

We then have
(1)*(x-x)-(x-1)(x^2-4)+(-1)(x^2-4) = 0 <=> x_1 = -2, x_2 = 0, x_3 = 2

3. ## Re: Matrix equation

Thats not how i shall solve it.. Factor is like next chapter they somehow solve this equation with that det

4. ## Re: Matrix equation

Can you specify how you are supposed to solve calculate the determinant?

5. ## Re: Matrix equation

Its the (2) the prob i get same but dont get -x^3

6. ## Re: Matrix equation

Originally Posted by Petrus
Its the (2) the prob i get same but dont get -x^3
Do you mean were
x+4(x-1)-x^2+4-x-x^2(x-1) = x+4x-4-x^2+4-x-x^3+x^2 = 4x-x^3

?

7. ## Re: Matrix equation

Just u type it made me solve it idk why but now i understand it!!! Ty alot