Question

2. If x = 3, y = 1 and z = -4, find the value of each of the following expressions.
(i) x2 + y2 +22 + 2xy + 2yz +2 zx
(ii) x3 +y +z - 3xyz
(iii) 4x2 + y2 + z2 - 4xy - 2 yz + 4zx
2
2
(iv) x2 + 4y2 +
4xy + 2yz - xz
4​

Answer 1

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