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Question

If x = 1, y = 2 and z = 3, find the value of x2 + y2 + 2xyz.

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Solution

Given:
x =1
y = 2
z = 3

Substituting x = 1, y = 2 and z = 3 in the given equation (x2 + y2 + 2xyz):

12 + 22 + 21231 + 4 + 12 = 17

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