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Finding Square of a Number Using Identity

Multiply: 3x...

Question

Multiply:
$(3 x - 5 y + 7 z)$ by -3xyz

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Solution

$(3 x - 5 y + 7 z) (- 3 x y z)$
= $(- 9 x^{2} y z + 15 x y^{2} z - 21 x y z^{2})$ (Ans.)

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