A questão é bem bonita. Parabéns! Se 3^m - 2^m = 65, então 3^m = 65 + 2^m e daí 3^m > 65. Assim m = 4. Da mesma maneira é possível majorar 2^m para a obtenção de um único m. Brasil.
@@professor_1o1 Yes I find it awesome to find ways to solve equations. However, I do not find the method that you use in the clip particularly awesome. The solution m=4 in this example is too obvious, and I would not even start to think about a strategy to solve the problem through algebraic means. But more importantly: your approach has worked in this case, but this is more or less by accident. Interestingly, you did not give a justification for factoring 65 as 5*15. Obviously, you chose the factors 5 and 13 because you knew that they would lead to the solution m=4. Try to use your method on the problem 3^m-2^m=211. Again, the solution m=5 is pretty obvious (m must be at leas 5, and 3^5-2^5=243-32=211). Applying the method from your clip, one has to find x,y such that x^2-y^2=211. But in this case, the factors ar not integer factors of 211, but irrational numbers x=9√3 and y=4√2.☹
Before watching the video: 3^m = log(3)m = ln(m)/ln(3) 2^m = log(2)m = ln(m)/ln(2) ln(m)/ln(3) - ln(m)/ln(2) = 65 ln(m)*(1/ln(3) - 1/ln(2)) = 65 ln(m) = 65/(1/ln(3) - 1/ln(2)) m = e^(65/(1/ln(3) - 1/ln(2))) = 9.619*10^-54 Plugging in for m, I get 0. Not sure what I did wrong here.