How do you simplify $-3xy (2x - 7y) + 6xy (9xy (9y - 2x)$ ?

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Answer 1 · 2018-07-24T12:04:24

As below

$-3xy (2x - 7y) + 6xy (9xy (9y - 2x)$

$=> -3x^2y + 21xy^2 + (6xy (81xy^2 - 18x^2y$

$=> -3x^2y + 21xy^2 + 486 x^2y^3 - 108x^3y^2$

$=> 3x^2y (162y^2-1) - 3xy^2(36x^2 - 7)$

How do you simplify -3xy (2x - 7y) + 6xy (9xy (9y - 2x)-3xy (2x - 7y) + 6xy (9xy (9y - 2x)?