Пожалуйста а) 3х(3х+7)-(3х+1)^2=9х^2+21х-9х^2-6х-1=15х-1
б) 4b(3b+6)-(3b-5)(3b+5)=12b^2-24b-9b^2+25=3b^2+24b+25
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Пожалуйста а) 3х(3х+7)-(3х+1)^2=9х^2+21х-9х^2-6х-1=15х-1
б) 4b(3b+6)-(3b-5)(3b+5)=12b^2-24b-9b^2+25=3b^2+24b+25