4y2-12y+9
how we'll solve this by using identity

Dear Student,

4y2-12y+9=2y2-22y3+32                      =2y-32                      Using identity: a2-2ab+b2=a-b2                      =2y-32y-34y2-12y+9=2y-32y-3

Hope this would have clear your doubt. Do let us know in case of nay further concerns.
 

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