richyw
Having trouble with some algebra
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lgbasallote
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welcome to the club
richyw
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my solutions manual goes from \[\vec{E}=k_eq\left( \frac{1}{(x-a)^2}-\frac{1}{(x+a)^2}\right)\hat{i}\]to\[\vec{E}=k_eq\frac{4ax}{(x^2-a^2)^2}\hat{i}\]
and I can't quite remember how to get that!
richyw
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I can get to \[\vec{E}=k_eq\left(\frac{4ax}{(x-a)^2(x+a)^2}\right)\hat{i}\]
so basically I have forgotten how to deal with the denominator :O
richyw
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without expanding it all out of course...
ganeshie8
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\(\vec{E}=k_eq\left(\frac{4ax}{(x-a)^2(x+a)^2}\right)\hat{i} \)
\(\vec{E}=k_eq\left(\frac{4ax}{((x-a)(x+a))^2}\right)\hat{i} \)
richyw
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oh wow
richyw
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i need to sleep haha
ganeshie8
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haha i agree ;p
richyw
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thanks a lot
ganeshie8
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np :)