Question

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-xy.(x^2-2xy+y^2)


4xy.(-x-3+y)


(a-5b-7ab).3ab^2

Answer 1

a)

= - xy.(x² - 2xy + y²)

= - xy.x² - xy.(- 2xy) - xy.y²

= - x³y + 2x²y² - xy³

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b)

= 4xy.(-x - 3 + y)

= 4xy.(-x) + 4xy.(-3) + 4xy.(y)

= - 4x²y - 12xy + 4xy²


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c)

= (a - 5b - 7ab). 3ab²

= 3ab².a + 3ab².(- 5b) + 3ab².(- 7ab)

= 3a²b² - 15ab³ - 21a²b³