So i got this equation, i want to solve for X, how do i do it:
(I-D)X=E

Question

So i got this equation, i want to solve for X, how do i do it:
(I-D)X=E

agreene · Answer

(I-D)X=E                    divide both sides by (I-D)
X=E/(I-D)             or in a slightly more pretty format:
$$X=\frac{E}{I-D}$$

anonymous · Answer

okay but this isnt a normal equation its a matrix equation

anonymous · Answer

you see i need to isolate that x, which is a output matrix

agreene · Answer

$$X=E\times(I-D)^{-1}$$

agreene · Answer

would be the normal matrix notation, if I remember correctly.

anonymous · Answer

okay thanks

amistre64 · Answer

not quite

agreene · Answer

I havent worked in matricies in a long time, so go for it amistre.

amistre64 · Answer

(I-D)X = E

we have to multiply by the inverse on the LEFT of each term

(I-D)^-1 (I-D)X = (I-D)^-1 E

X = (I-D)^-1 E

amistre64 · Answer

B^-1 A not = A B^-1  in general

agreene · Answer

yeah, i vaguely remember that now, lol

amistre64 · Answer

:)

anonymous · Answer

nice job smart guy

amistre64 · Answer

i learn from my mistakes; and i have made alooot of mistakes ;)

anonymous · Answer

okay man heres your medal