If x = 2, y = 3 and z = -1, find the values of:

If x = 2, y = 3 and z = -1, find the values of:
(i) x + y
(ii)
(iii)

Solution:

If a = 2, b = 3 and c = -2, find the value of a² + b² + c² – 2ab – 2bc – 2ca + 3abc.

Solution:

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