Friday, September 30, 2011

2^(3x-5)=1/2^(2x-10) Find x.

Given that: 2^(3x-5) =
1/2^(2x-10)


We will
re-wrtie.


We know from exponent properties that 1/x^a =
x^-a.


==> 1/2^(2x-10) =
2^-(2x-10).


Then, we will
substitute.


==> 2^(3x-5) =
2^-(2x-10)


Now that we have the bases are equal, then the
powers must be equal too.


Then, we conclude that 3x-5 =
-(2x-10)


Let us solve the
equality.


==> 3x - 5 = -2x +
10


We will add 2x to both
sides.


==> 2x+3x - 5 = 2x-2x +
10


==> 5x - 5 = 10


Now
we will add 5 to both sides.


==> 5x - 5 +5 = 10 +
5


==> 5x = 15.


Now we
will divide by 5.


=> x = 15/5 =
3


Then the answer is x =
3

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