solve using identities (7a -9b)*(7a -9b)
pls give the answer in detail
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Answered by
3
hey doood.....
this is in the form(a-b)*(a+b)
so it is 7a^2 - 9b^2
Saihaniya:
thx...but in moredetail pls
more detail*
Answered by
2
as per given in the question
(7a-9b) *(7a-9b)
means .................... (a-b)^2
therefore (7a-9b)^2
(7a)^2 - 2*7a*9b + (9b)^2
= 49a^2 - 126ab + 81b^2
(7a-9b) *(7a-9b)
means .................... (a-b)^2
therefore (7a-9b)^2
(7a)^2 - 2*7a*9b + (9b)^2
= 49a^2 - 126ab + 81b^2
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