Question

find the product: 1) (pq-2r) (pq-2r)
help me ​

Answer 1

1) (pq-2r)(pq-2r)

= p²q² - 2pqr - 2pqr + 4r²

=( p²q² - 4pqr + 4r² ) = (pq-2r)²

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Answer 2

Answer:

Ur ans is p²q² + 4r² - 4pqr

Step-by-step explanation:

( pq - 2r ) ( pq -2r)

As we observe here the two terms are same ,so we can square them

For example :

a x a = a²

Then ,

( pq - 2r ) ( pq - 2r )

( pq - 2r )² { Since , ( a - b ) ² = a² + b² - 2ab }

=> p²q² + 4r² - 4pqr

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