Question

Factorise: a ²-81(b-c) ²​

Answer 1

Answer:

Correct option is

D

(a+9b−9c)(a−9b+9c)

a

2

−81(b−c)

2

Using,

a

2

−b

2r

=(a+b)(a−b)

=[a+9(b−c)][a−9(b−c)]

=(a+9b−9c)(a−9b+9c)

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