If `A=[[1,-1,4] , [3,8,9]]` then find the value of matrix `X` where `X+A=O`

If A=[[1,-1,43,8,9]] then find the value of matrix X where X+A=O

If [[9,-1,4],[-2,1,3]]=A+[[1,2,-1],[0,4,9]] then find the matrix A.

Find the value of : 3x^(2)+9x^(2)-x+8 where x=-2

If [2x , 3][{:(1,2),(-3,0):}],[{:(x),(8):}]=O then find the value of x .

If [2x,3] {:[(1,2),(-3,0)][(x),(8)]= O , find the value of 'x'.

A=[{:(1,4),(3,2),(2,5):}]andB=[{:(-1,2),(0,5),(3,1):}] then find the matrix X. where A+B-X=0.0 is a zero matrix.

If [(9,-1,4),(-2,1,3)]=A+[(1,2,-1),(0,4,9)], then find the matrix A.

For the symmetric matrix, A=[(2,x,4),(5,3,8),(4,y,9)] find the values of 'x' and 'y'