Question

expand the following by using identities ( 3a -7 ) 2​

Answer 1

Answer:

I think that it is 3a square so I am answering according to that it's a bit of confusion weather it is (3a-7) × 2 or (3a-7 )^2

Step-by-step explanation:

so , by using the identity (a-b)^2 = a^2+2 ab+b^2 .

( 3a-7 )^2 = (3a)^2 - (2×3a×7) - (7)^2

= 9a^2 - 42a - 49

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Answer 2

I hope upper attachment will help you✌