Question

a²-81(b-c)² solve this question

Answer 1

Answer:

is the right answer of this question

Answer 2

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${a}^{2} - 81(b - c {)}^{2} \\ (a {)}^{2} - (9 {)}^{2} \times ((b {)}^{2} - 2(b)(c) + (c {)}^{2} ) \\ (a + 9)(a - 9) \times ( {b}^{2} - 2bc + {c}^{2} )$

Note:

The following identities are used..

${a}^{2} - {b}^{2} = (a + b)(a - b) \\ (a - b {)}^{2} = {a}^{2} - 2ab + {b}^{2}$

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