Could anyone help me ,please?
Only the (✅) ones. Thank you !
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I have done 13
Use the identity a²-b²=(a+b)(a-b)
Use the identity a²-b²=(a+b)(a-b)
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sarthak8970:
hi from where are you
India
India
which place
rajasthan
ok im from Bihar (Patna)
can we become friends
ok follow me
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u can also do it in this manner
( 7p+9q)(7p-9q)
= 7p (7p+9q)-9q(7p+9q)
=49p²+63pq-63pq -81q² [63pqand -63pq will be cancelled]
=49p²-81q² (answer)
( 7p+9q)(7p-9q)
= 7p (7p+9q)-9q(7p+9q)
=49p²+63pq-63pq -81q² [63pqand -63pq will be cancelled]
=49p²-81q² (answer)
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