Germany | Can you solve this? | Math Olympiad Problem

[@djt7687]

an easier way: multplikate with 8=2^3 in the beginning: so you have 2^(x+2) = 21; so x+2= lg 21/lg2=lg(3*7)/lg2= log3to2 +log 7to2, follwing x=log3to2+log7to2 -2

[@MasterTMathsClass]

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[@에스피-z2g]

2^x=21/4
x=log21/log2-2

[@MasterTMathsClass]

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[@AndreTewen]

In |C the solutions are :
X = (ln(3)+ln(7)/ln(2) - 2 + i.2k.pi/ln(2).
X is real if k = 0.

[@MasterTMathsClass]

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