**Anonymous**09/04/14(Thu)23:19 UTC+1 No.6735788 Report

Multiply by 2x/2x

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The answer to b is suppose to be -1/4. What should I do to get there?

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In the denominator, you used 2 for f(2), but in the numerator you used 1/2 for f(2). Fix that and try what the other anon said, and let us know if that doesn't work either.

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>>6735788

It works, but for what reason did you choose 2x/2x specifically?

It works, but for what reason did you choose 2x/2x specifically?

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>>6735861

Not that anon, but multiplying by 2x/2x is the same as multiplying by one. More than that, it also gets the denominators in the top part of the fraction to be the same, so then you can do more stuff with it.

Not that anon, but multiplying by 2x/2x is the same as multiplying by one. More than that, it also gets the denominators in the top part of the fraction to be the same, so then you can do more stuff with it.

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>>6735782

Here's what I did.

Find a common denominator for the top part of the fraction. You'll quickly see that things can cancel out, provided you pulled out a -1 from one of them. Try it.

Here's what I did.

Find a common denominator for the top part of the fraction. You'll quickly see that things can cancel out, provided you pulled out a -1 from one of them. Try it.

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>>6735782

ITT: Retards

OP, do you even L'Hopital's rule? It's indeterminate form. Take the derivative of numerator and denominator.

Although, I think you made a mistake in formulating the question because according to what you wrote f(2) equals both 1/2 and 2 at the same time. This is not a function...

ITT: Retards

OP, do you even L'Hopital's rule? It's indeterminate form. Take the derivative of numerator and denominator.

Although, I think you made a mistake in formulating the question because according to what you wrote f(2) equals both 1/2 and 2 at the same time. This is not a function...

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>>6735891

That evaluates to 0, not -1/4. The way you wrote it before evaluates to -1/4

That evaluates to 0, not -1/4. The way you wrote it before evaluates to -1/4

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First step is to find common denominator for the numerator and combine the terms. Then multiply by -1/-1 so shit cancels.

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

(x-2)/-2x * 1/(x-2) = 1/-2x

x=2, 1/-2x = -1/4

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

(x-2)/-2x * 1/(x-2) = 1/-2x

x=2, 1/-2x = -1/4