Question

a*2-(b-c) *2 please help me​

Answer 1

Answer:

Here is your answer

{a}^{2} - 81(b - c {)}^{2} \\ {a}^{2} - (9b - 9c {)}^{2} \\ using \: identity \: {a}^{2} - {b}^{2} = \\ (a + b)(a - b) \\ \\ (a +( 9b - 9c))(a - (9b - 9c)) \\( a + 9b - 9c)(a - 9b + 9c)

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