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# Rearranging Equations watch

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1. Hi!

I seem to struggle alot with maths so this question will seem very easy but how do I rearrange the following equation to find a (where a and Kc are constants):

Kc = [a] / [0.1-a]

I know that the first step is

Kc [0.1-a] = a

But not sure where to go from there, can any show me step by step how to do this?
2. multiply, collect like terms, and factorise.
3. is this chemistry?
like the person above said, multiply it all out. put all terms containing 'a' on one side, then factorise it.

Kc [0.1-a] = a
0.1Kc - aKc = a
0.1Kc = a + aKc
0.1Kc = a(1 + Kc)

a = 0.1Kc / (1 + Kc)

i might well of made a mistake though, its been ages since i've done maths
4. (Original post by didgeridoo12uk)
is this chemistry?
like the person above said, multiply it all out. put all terms containing 'a' on one side, then factorise it.

Kc [0.1-a] = a
0.1Kc - aKc = a
0.1Kc = a + aKc
0.1Kc = a(1 + Kc)

a = 0.1Kc / (1 + Kc)

i might well of made a mistake though, its been ages since i've done maths
Yeah chemistry and thanks!

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