Evaluate the expression $5 x + 7 y - 8 z + 12,$ when $x = 2, y = 3, z = 4 .$

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Solution

The given expression is $5 x + 7 y - 8 z + 12,$ where $x = 2, y = 3, z = 4 .$
Putting the value of $x, y$ and $z$ in the above expression, we get $5 (2) + 7 (3) - 8 (4) + 12$
$= 10 + 21 - 32 + 12$
$= 43 - 32$
$= 11 .$
Hence, the value for the expression $= 11$ .

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