What is the answer to 2= 4/(1-r) ?

The answer to 2= 4/(1-r) is r=-1

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2= 4/(1-r)

2 = \frac{4}{1 - r}

r = - 1

Solution steps

2 = \frac{4}{1 - r}

Multiply both sides by

1 - r

2 (1 - r) = 4

Divide both sides by

2

1 - r = 2

Move

1

to the right side

- r = 1

Divide both sides by

- 1

r = - 1

Verify Solutions

Find undefined (singularity) points:

r = 1

Combine undefined points with solutions:

r = - 1

\frac{3 k}{7 k} = \frac{C}{C + 1470}

\frac{x - 1}{x + 1} = \frac{5}{6}

- \frac{2}{5 y} = 4

a^{- 2} = \frac{1}{16}

\frac{x - 1}{3} = \frac{x + 5}{x - 1}