If x = 1 , y = -1 , z = 3 , then find the value of

`z^2 - x^2`

If x = 1, y = 2, z = 5 , then find the value of 3x – 2y + 4z.

If a = 2 , x = 1, y = 1 , z = 1 then find the value of a^x times a^y times a^z

If x = 1, y = 2 , z = 5 , find the value of x^3 - y^3 -z^3

If x=1, y=2 and z =3 then find the value of x^3 - z^3 + y^3

If x = 1, y = 2 and z = 5 , find the value of 3x – 2y + z .

If x=1, y=2, z=-1 then find the value of z^2-2xy(x-y)

If x = 1, y = - 2 and z = 3. find the value of (i) x^(3) + y^(3) + z^3-3xyz (ii) 3xy^(4) - 15 x^(2) y + 4z

If x = 2a- 1, y = (2a - 2) and z =3 - 4a, then the value of x ^(3) + y ^(3) + z ^(3) will be :

If x=1, y=2 and z=3 , find the value of x^(2)+y^(2)+2xyz .

If x:y=2:3 , y:z=3:4 , z:k=1:2 , find the value of x:y:z:k