Question

Factorise 27x^3 - 1728y^3

Answer 1

Answer:

=(3x+7y)(9x^2-21xy+49y^2)

27x^3+343y^3

=(3x)^3+(7y)^3

Using the formula

a^3+b^3=(a+b)(a^2-ab+b^2)

the given expression becomes

=(3x+7y)(3x)^2-3x*7y+(7y)^2

=(3x+7y)(9x^2-21xy+49y^2)

Step-by-step explanation:

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