1.

Factorise:8(x+y)³+27(x-y) ³​

Answer»

ANSWER:

Step-by-step EXPLANATION:

ANSWER

8(X+y)

3

−27(x−y)

3

=[2(x+y)]

3

−[3(x−y)]

3

=[2(x+y)−3(x−y)][(2(x+y))

2

+2(x+y)×3(x−y)+(3(x−y))

2

]

=(2x+2y−3x+3y)[4(x

2

+2xy+y

2

)+6(x

2

−y

2

)+9(x

2

−2xy+y

2

)]

=(−x+5y)(4X

2

+8xy+4y

2

+6X

2

−6y

2

+9x

2

−18xy+9y

2

)

=(−x+5y)(19x

2

−10xy+7y

2

)


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