Friday, April 19, 2013

What is x if 2/(2x-2) + 2/(2x+2) = 10

First, We'll factorize by 2 the denominators from the
given expression:


2/2(x-1) + 2/2(x+1) =
10


We'll simplify and we'll
get:


1/(x-1) + 1/(x+1) =
10


we'll move all terms to one
side:


1/(x-1) + 1/(x+1) - 10 =
0


Now, we'll determine the least common
denominator:


LCD =
(x-1)(x+1)


We notice that the result of the product is the
difference of squares:


(x-1)(x+1)  = x^2 -
1


We'll re-write the
equation:


x + 1 + x - 1 - 10(x^2 - 1) =
0


We'll remove the brackets and we'll combine and eliminate
like terms:


2x - 10x^2 + 10 =
0


We'll divide by -2 and we'll re-arrange the
terms:


5x^2 - x - 5 = 0


We'll
apply the quadratic formula:


x1 = [1 + sqrt(1 +
100)]/10


x1 =
(1+sqrt101)/10


x2 =
(1-sqrt101)/10


Since the roots are different
from the values 1 and -1, we'll consider as being valid.

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