[" 2.If "x=1,y=2" and "z=5" ,find the value of "],[[" (i) "3x-2y+4z," (ii) "x^(2)+y^(2)+z^(2),],[" (iv) "xy+yz-zx,," (v) "2x^(2)y-5yz+xy^(2)]]

If x = 1, y = 2 and z = 5, find the value of (i) 3x - 2y + 4z (ii) x^(2) + y^(2) + z^(2) (iii) 2x^(2) - 3y^(2) + z^(3) (iv) xy + yz - zx (v) 2x^(2) y - 5yz + xy^(2) (vi) x^(3) - y^(3) - z^(3)

x+y-z=5 and x^(2)+y^(2)+z^(2)=29, find xy-yz-zx

find the value of x+y+z if x^(2)+y^(2)+z^(2)=18 and xy+yz+zx=9 .

If x = 6, y = 4 and z = 3, then find the value of x ^(2) + y ^(2) + z ^(2) - 2xy + 2 yz - 2 zx.

If X:Y=3:4,Y:Z=5:2 then find the value of X:Y:Z.

Factorise : x^(2)+y^(2)+z^(2)-xy-yz-zx

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