Hi! For question #9 on page 111 in the Exponents and Exponential Functions section, how did you get 2mn in m^2+2mn+n^2=m^2+n^2? Thank you!

Hi, that’s just the result from FOILing the left side of (m+n)^2=m^2+n^2.

(m+n)^2\\=(m+n)(m+n)\\=m^2+mn+mn+n^2\\=m^2+2mn+n^2

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