Question

Factorise 8x cube + root 27 y cube

Answer 1

Try putting the formula
a^3+b^3=(a+b)(a^2-ab+b^2)
I will prefer that you try it out yourself with the given formula as this is a very easy sum and it will help you learn.
Hope it helps.

Answer 2

Hey There,


Here we are going to use the identity :
$a^3+b^3 = (a+b)(a^2-ab+b^2)$


We can solve this question in the same way as follows:

$8x^3+27y^3 \\ \\ =(2x)^3+(3y)^3 \\ \\ =(2x+3y)((2x)^2-(2x)(3y)+(3y)^2) \\ \\ = (2x+3y)(4x^2-6xy+9y^2)$


Hope it helps
Purva
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