9. x(x + y)^3 - 3x²y(x + y)
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Step-by-step explanation:
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Answer:
x(x + y)(x^2 + y^2 - xy).
Step-by-step explanation:
Equation = x(x + y)^3 - 3x^2y(x + y)
= x(x + y)(x + y)(x + y) - 3x*xy(x + y)
= x(x + y)[(x + y)(x + y) - 3xy]
= x(x + y)[(x + y)^2 - 3xy]
= x(x + y)[(x^2 + y^2 + 2xy - 3xy)]
= x(x + y)(x^2 + y^2 - xy).
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