Question

factorisation of 7a²_63b²​

Answer 1

Answer:

$7a {}^{2} - 63b {}^{2} \\ = 7(a {}^{2} - 9b {}^{2} ) \\ = 7{(a {}^{2} - (3b) {}^{2} }) \\ 7(a + 3b)(a - 3b)$

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Answer 2

7a^2-63b^2=7(a^2-9b^2)
a^2-b^2=(a+b) ( a-b)
=7{(a)^2 -(3b)^2}
=7{(a+ 3b) (a-3b)}