2x/x2-25=10/x2-25 - 4/x+5

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03-09-2016
Mathematics

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2x/x2-25=10/x2-25 - 4/x+5

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jhonyy9 jhonyy9 · Answer 1 · 2016-09-03T19:55:12+02:00

first of all you need push the restriction for what x value the denominator result 0 bc. than this fraction will be undefined
- so x^2 -25 = 0
(x-5)(x+5)=0
x-5=0 =>x=5
and
x+5=0 =>x=-5
so this mean that x not can being equal +/- 5

rewrite :
x^2 -25 = (x-5)(x+5)

2x 10 4
------------- = ------------------ - -----------
(x-5)(x+5) (x-5)(x+5) x +5

2x = 10 -4(x-5)
2x = 10 -4x +20

6x = 30

x = 30/6

x = 5 what is restriction for x

hope helped