Which of the equations are true identities?

asked Mar 4, 2021 33.8k views

1 vote

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3 votes

Answer:

only a

Explanation:

Ken Ko answered Mar 7, 2021

4.6k points

5 votes

$m^(3)-1=(m-1)(1+m+m^(2) ) \\m^(3)-1=m+m^(2)+m^(3) -1-m-m^(2)\\ m^(3)-1=m^(3)-1$

$(n+3)^(2)+2n=8n+13\\n^(2)+6n+9+2n=8n+13\\ n^(2)+8n+9=8n+13$

answer: only A

StephaneM answered Mar 8, 2021

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