Maths: Algebra Matrices Class 12th
posted by Akash .
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

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.