Question

(x - y)³ - 8 (x + y)³
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Answer 1

Answer:

Step-by-step explanation:

(x-y)³ - 8 (x+y)³

= {x³ - y³- 3xy (x-y)} -8 {x³+y³ + 3xy (x+y)}

= (x³ - y³ - 3x²y + 3xy²) -8 ( x³+y³ + 3x²y +3xy²)

=x³ - y³ - 3x²y + 3xy² - 8x³ - 8y³ - 24x²y - 24xy²

= -7x³ - 9y³ - 27x²y - 21xy²

Hope it helped you