-9 x ___ = - 81

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Solution

To get a negative product -9 has to be multiplied by a positive number.
$- 9 \times 9 = - 81$

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Question 81 (iii)

Add :

$x y^{2} z^{2} + 3 x^{2} y^{2} z - 4 x^{2} y z^{2}, - 9 x^{2} y^{2} z + 3 x y^{2} z^{2} + x^{2} y z^{2}$

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