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If x = 1, y = 2 and z = 5, find the valu...

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)`

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