Evaluate of the expression if $x = 1, y = - 2, z = - 1$ .
$3 x^{2} z - 4 y z + 3 x y - (- y z - 7 z)$ .

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Solution

$x = 1,$ $y = - 2,$ $z = - 1$
$\Rightarrow 3 x^{2} z - 4 y z + 3 x y - (- y z - 7 z)$
$\Rightarrow - 3 - 8 - 6 - (- 2 + 7)$
$\Rightarrow - 17 - (5)$
$\Rightarrow - 22$
Hence, the answer is $- 22.$

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