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Popular >

20=5*2^{-2k}

Solution

20 = 5 \cdot 2^{- 2 k}

Solution

k = - 1

Solution steps

20 = 5 \cdot 2^{- 2 k}

Switch sides

5 \cdot 2^{- 2 k} = 20

Divide both sides by

5

2^{- 2 k} = 4

Apply exponent rules

- 2 k = 2

Solve

- 2 k = 2 : k = - 1

k = - 1

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5^{x + 1} = 100 (3)^{x}

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2 \cdot 3^{x} + 5 = 17

300*10^x=20*20^x

300 \cdot 1 0^{x} = 20 \cdot 2 0^{x}

Frequently Asked Questions (FAQ)

What is the answer to 20=5*2^{-2k} ?
The answer to 20=5*2^{-2k} is k=-1
Solve for k: 20=5*2^{-2k}
The solution is k=-1