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Measures and Numbers

The value of ...

Question

The value of :
$(x + 2 y + z) + (x + y + z) - (3 x + 2 y + 2 z)$ at $x = 1, y = 1, z = 1$

A

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B

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D

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Solution

The correct option is A 0
$(x + 2 y + z) + (x + y + z) - (3 x + 2 y + 2 z)$
$= (1 + 2 + 1) + (1 + 1 + 1) - (3 + 2 + 2)$
$= 4 + 3 - 7 = 0$

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