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प्रश्न
27x3 − y3 − z3 − 9xyz
उत्तर
The given expression to be factorized is
`27x^3 - y ^3 z^3 - 9xyz`
This can be written in the form
`27x^3 - y^3 - z^3 - 9xyz = (3x)^3 + (-y)^3+(-z)^3 -3 (3x)(-y)(-z)`
Recall the formula
`a^3+b^3 +c^3 -3abc = (a+b+c)(a^2 +b^2 +c^2 - ab - bc -ca)`
Using the above formula, we have
`27x^3 - y^3 -z^3 - 9xyz`
`={3x +(-y) + (-z)}{(3x)^2 + (-y)^2+ (-z)^2 - (3x)(-y)-(-y)(-z )- (-z)(3x)}`
` = (3x-y -z)(9x^2 +y^2 +z^2 + 3xy - yz + 3zx)`
We cannot further factorize the expression.
So, the required factorization is of `27x^3 - y^3-z^3 -9xyz` is `(3x -y-z)(9x^2 +y^2 +z^2 +3xy -yz +3zx)`.
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