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Definition of Function

If x=2, y=1, ...

Question

If $x = 2, y = 1, z = - 3$ , find the value of each of the following :
$x^{2} + 2 x y + y^{2} + z^{2}$

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Solution

$= x^{2} + 2 x y + y^{2} + z^{2} = {(2)}^{2} + (2 \times 2 \times 1) + {(1)}^{2} + {(- 3)}^{2} = 4 + 4 + 1 + 9 = 18$

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