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Make n the subject of the formula if w frac v 2... - JAMB Mathematics 2012 Question

Make 'n' the subject of the formula if w = (\frac{v(2 + cn)}{1 - cn})

A
\(\frac{1}{c}(\frac{w - 2v}{v + w})\)
B
\(\frac{1}{c}(\frac{w - 2v}{v - w})\)
C
\(\frac{1}{c}(\frac{w + 2v}{v - w})\)
D
\(\frac{1}{c}(\frac{w + 2v}{v + w})\)
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Correct Option: A

w = (\frac{v(2 + cn)}{1 - cn})

2v + cnv = w(1 - cn)

2v + cnv = w - cnw

2v - w = -cnv - cnw

Multiply through by negative sign

-2v + w = cnv + cnw

-2v + w = n(cv + cw)

n = (\frac{-2v + w}{cv + cw})

n = (\frac{1}{c}\frac{-2v + w}{v + w})

Re-arrange...

n = (\frac{1}{c}\frac{w - 2v}{v + w})

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