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This is one fraction minus another fraction to equal yet another fraction

2006-10-11 14:06:41 · 8 answers · asked by honest abe 4 in Science & Mathematics Mathematics

8 answers

im assuming that you mean:
x/(x+4)=4/(x-4)-28/(x^2-16)

multiply both sides by (x+4)(x-4) since it is the least common denominator (x^2-16)=(x+4)(x-4) since it's a difference of squares

x(x-4)=4(x+4)-28
x^2-4x=4x+16-28
x^2-8x+12=0
(x-6)(x-2)=0
x=either 6 or 2

2006-10-11 14:12:06 · answer #1 · answered by cardsfan 2 · 0 0

Get rid of the fractions by multiplying by the lowest common denominator, which is (x+4)(x-4), or x^2-16

x(x-4)=4(x+4)-28
remove ()
x^2-4x=4x +16-28
subtract 4x, add 12 to both sides
x^2 -8x +12=0
factor
(x-6)(x- 2)=0
set each factor =0 and solve
x-6=0, so x=6
x-2=0, so x=2

2006-10-11 15:22:39 · answer #2 · answered by mom 7 · 0 0

(x/(x + 4)) = (4/(x - 4)) - (28/(x^2 - 16))

Multiply everything by (x + 4)(x - 4)

x(x - 4) = 4(x + 4) - 28
x^2 - 4x = 4x + 16 - 28
x^2 - 4x = 4x + 12
x^2 - 8x + 12 = 0
(x - 6)(x - 2) = 0

x = 6 or 2

2006-10-11 17:03:31 · answer #3 · answered by Sherman81 6 · 0 0

x/(x+4)=4/(x-4)-28/((x-4)(x+4))
where (x^2-16)=(x-4)(x+4)
so: muliply all tew equation by ((x-4)(x+4))
so: x(x-4)=4(x+4)-28
x^2-4x=4x+16-28
x^2-8x+12=0
(x-6)(x-2)=0
so the answer
x=6
x=2
besr chance

2006-10-11 14:18:05 · answer #4 · answered by adel khaled 2 · 0 0

x/4 sixteen/60 whenever you have a fraction resembling a fraction, you're in a position to do away with stated fractions making use of bypass multiplication. this form you have in ordinary terms one line to artwork with. it somewhat is finished with appropriate here formula: a/b = c/d will become advert = bc. making use of this: x/4 = sixteen/60 will become: 60x = sixty 4 Now, we in ordinary terms divide by way of capacity of x: x = sixty 4/60 And simplify: x = sixteen/15

2016-12-08 13:08:49 · answer #5 · answered by Anonymous · 0 0

i think you multiply x times x then x time 4 and add it up. well is hard to explain i have to write it not type it. sorry.

2006-10-11 14:09:44 · answer #6 · answered by Curiouz 1 · 0 0

x = Phoenix?

2006-10-11 14:08:47 · answer #7 · answered by Anonymous · 0 1

x = 9.22087

2006-10-11 14:19:44 · answer #8 · answered by Anonymous · 0 0

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