Add the following :
`x^2 + y^2 + z^2 , 2x^2 + 3y^2 - z^2`

By using inverse of a matrix, solve the following equations: x+2y-2z = 5 , -x+3y =2 , -2y+z = -3

The pair of simultaneous equations from the following is…………………(1) 2x+2y=7 (2) 4x+3z=9 (3) 3y+4z=8 (4)3z+9x=18 a)1 and 2 b)2 and 3 c)3 and 4 d)2 and 4

Express the following equation in matrix form and solve them by the method of reduction: x-y+z = 1 , 2x-y = 1 , 3x+3y-4z = 2

Express the following equation in matrix form and solve them by the method of reduction: x+y+z = 1 , 2x-y+7z = 7 , 3x+y+2z = 2