Question

Which of the equations are true identities?

Answer 1

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

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

answer: only A

Answer 2

Answer:

only a

Step-by-step explanation: