Problem: 1 - x-3/x-2 = 2x-3/x-2(adsbygoogle = window.adsbygoogle || []).push({});

OK I know the answer in the back of our text book is: No Solution

Yet...

I work out the problem to get, x=2

Here is how I got that.

[x-2) - (x-3)]/x-2 = 2x-3/x-2

x-2-x+3=2x-3

4=2x

2=x

Now I know that if 2 is put back in for x undefined values occur.

1 - (undefined value) = (undefined value)

So what I don't understand is how is x=2 a solution if it doesn't work in the original equation?

And if it is not an actual solution than how come it came up as one?

2nd Problem:

[Earth Science]

In 1984, the Soviets led the world in drilling the deepest hole in the Earth's crust--more than 12 kilometers deep. They found that below 3 kilometers the temperatureTincreased 2.5 (degrees) C for each additional 100 meters of depth.

(A) If the temperature at 3 kilometers is 30 (degrees) C and x is the depth of the hole in kilometers, write an equation using x that will give the temperatureTin the hole at any distance beyond 3 kilometers.

Ok I figured that:T= 2.5[(x-3)/100] + 30

But the answer is different...

[Answer:T= 30 + 25(x-3)]

But...if you put in a number, x in meters, in my equation, and put in a number x in km, in the 'back of the books equation' you get the same answer.

T(4000 m) = 55 (degrees) C

T(4 km) = 55 (degrees) C

So...not sure which is 'right' per say, some help would be nice...

Thanks.

-Tony Zalles

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# Homework Help: Precalculus Problem

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