Question

simplify (7m-4n)²-(7m+4n)²​

Answer 1

Answer:

-16n

Step-by-step explanation:

plz see attachment

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Answer 2

Answer:

Hope it helpful.

Step-by-step explanation:

soluation:-

$(7m-4n)^{2} - (7m+4n)^{2} \\=[ (7m)^{2} -2*7m*4n+(4n)^{2}]-[(7m)^{2}+2*7m*4n+(4n)^{2} ]\\=49m^{2}-56mn+16n^{2}-49m^{2}-56mn-16n^{2}\\=-112mn$