book Maths Puzzle Numerical Ability

How do you simplify the following:

{{{ 0.419 = 1sqrt(1-(v^2/c^2)) }}}

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book Other Question

64^x=4

please help if you do not mind. thank you very much
When we have an equation of logarithms how do we work to solve it?(is that the right way or not?)Write a methodology please...
for ex:

log3x + log(x+5) = log(X^2+4x)/X>0,X different from 0