Describe how to use the general pattern for finding the square of a binomial (a+b)^2 to write the expansion of (3m+5n)^2?

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I have no idea what it means or what the question is asking for. Algebra exams are coming up so if you could explain how you got the answer that would be great... Thanks!

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Answer 1 · 2018-04-26T21:18:10

#(3m+5n)^2= 9m^2+30mn+25n^2#

#(a+b)^2=a^2+2ab+b^2#

So:

#(3m+5n)^2=(3m)^2+2(3m*5n)+(5n)^2#

#(3m+5n)^2= 9m^2+30mn+25n^2#