Предмет: Алгебра, автор: Дианочка56789

12fg+(2f-3g)(кв) помогите пожалуйста

Ответы

Автор ответа: dtnth

6

По формулам $(A-B)^2=A^2-2AB+B^2$
$(AB)^n=A^nB^n$
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$12fg+(2f-3g)^2=12fg+(2f)^2-2*(2f)*(3g)+(3g)^2=\\\\12fg+4f^2-12fg+9g^2=4f^2+9g^2$

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