use suitable Identities to get each of the
fallowing produts
(7a - 9b) (7a-9b)
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(7a-9b) =(a-b)^2=a^2-2ab+b^2
=7a^2-2*7a*9b+9b^2
49a^2-126ab+81b^2
(49a-81b) (49a+81b)
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