Sunday, August 3, 2014

If log(a) 2 + log(a) 4 = log (2) a^2, what is a?

log(a) 2 + log(a) 4 = log(2) a^2
.


We will use logarithm properties to find
a.


We know that log a + log b = log
a*b


==> log(a) 2 + log(a) 4 = log(a) 2*4 = log(a)
8


==> log(a) 8 = log(2)
a^2


Now we will
rewrite:


log(a) 8 = log(2) 8 / log(2) a = log(2) 2^3 /
log(2) a = 3/log(2) a


==> 3/log(2) a = log(2)
a^2


==> 3 = 2log(a) 2 * log(2)
a


==> 2[log(2) a)'^2 =
3


==> log(2) a = sqrt(3/2)=
sqrt(1.5)


==> Now we will rewrite into exponent
form.


==> a =
2^(sqrt(1.5)

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