What should be added to `x y+y z+z x` to get ` x y-y z-z x ?` `-2x y-2y z-2z x` (b) `-3x y-y z-z x` `-3x y-3y z-3z x` (d) `2x y+2y z+2z x`

What should be added to x y+y z+z x to get x y-y z-z x ? (a) -2x y-2y z-2z x (b) -3x y-y z-z x (c) -3x y-3y z-3z x (d) 2x y+2y z+2z x

If x + y = 2z then (x)/(x-z) +(z)/(y-z) = ?

x+y+z=1 x-2y+3z=2 5x-3y+z=3

2x+y-z=1 x-y+z=2 3x+y-2z=-1

Add 2x - 3y + z , 5y - x + 7z and 3x - y - 6z.

A person travels three equal distances at a speed of x km/hr, y km/hr and z knyhr respectively. What is the average speed for the whole journey? (x y z)/(3(x y+y z+z x)) b. (x y z)/((x y+y z+z x)) c. ((x y+y z+z x))/(x y z) d. (3x y z)/((x y+y z+z x))

Show that : |x y z x^2y^2z^2x^3y^3z^3|=x y z(x-y)(y-z)(z-x)dot

(x + y) ^ (3) + (y + z) ^ (3) + (z + x) ^ (3) -3 (x + y) (y + z) (z + x)

Solve using matrices, for x,y and z: 2x-y-z = 7, 3x+y - z = 7, x + y - z = 3.

2x + 3y + z = 11, x + 2y + z = 8, x-y + z = 2