Friday, May 13, 2011

log( x^2 + 2 ) = log ( x^2 - 3x + 5) find x value.

We'll impose the constraints of existence of
logarithms.


The first condition
is:


x^2 + 2 > 0


Since
x^2 is always positive for any value of x, the amount:


x^2
+ 2  is also positive, fro any value of x.


The second
condition is:


x^2 - 3x + 5 >
0


We'll calculate the discriminant of the quadratic to
verify if it is negative:


delta = 9 - 20 = -11 <
0


Since delta is negative, the expression x^2 - 3x + 5 is
also positive, fro any value of x.


Conclusion: The solution
of the equtain could be any value of x.


Now, we'll solve
the equation:


log( x^2 + 2 ) = log ( x^2 - 3x +
5) 


Since the bases are matching, we'll apply one to one
property:


x^2 + 2 = x^2 - 3x +
5


We'll eliminate and combine like
terms:


3x - 3 = 0


We'll divide
by 3:


x - 1 = 0


x =
1


The solution of the equation is x =
1.

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