Posted by **Akash** on Monday, April 11, 2011 at 6:12am.

matrix{{0, 1, -1}, {2, 1, 3}, {1, 1, 1}} matrix{{1, -1, x}} matrix{{0}, {1}, {1}}=0

Find the value of x

Don't give me the direct answer. Please tell me how to go about this. Draw in your notebook and then solve

- Maths: Algebra Matrices Class 12th -
**MathMate**, Monday, April 11, 2011 at 7:54am
Your matrix notation does not distinguish rows from columns, which is critical in matrices.

The best possible interpretation I get is:

a11 a12 a13

a21 a22 a23

a31 a32 a33

multiplied by

b1

b2

b3

to give

c1 c2 c3

which is then multiplied by another

d1

d2

d3

to give

e=0

So multiply rows of a to the column b to give c, for example:

c1=a11*b1+a12*b2+a13*b3

and similarly for the other rows.

Same for e:

e=c1*d1+c2*d2+c3*d3

Through the multiplication, you will preserve the value of x, and equate the value of e to zero to solve for x.

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