- How we calculate bond length?

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What are the result for these equation A.....49m^2 - 121n^2?
B......4ap - 8aq + bp - 2bq
C......121 + 132x + 36x^2 please? Sodium sulfide initial concentration 0.50M, and reacts with water, K=1.0 what is ph at equilibrium? What is a profitable endeavor but is also giving, and sacrificing at the same time? What is the main product when 249 97Bk emits a gamma ray? Why do get different answer when factor vs when use quadratic formula? Ex: 3x^2+(-4)+1=0, I get 3, 1 using q. form, but 1/3, 1 via factoring?