Given that 3×27n=1\sqrt{3}\times27^{n}=1, find the value of n.

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Worked solution

10

1. Express each term as a power of 3.

3=312\sqrt{3}=3^{\frac12} and 27=3327=3^3.

So
3×27n=312×(33)n.\sqrt{3}\times 27^n=3^{\frac12}\times (3^3)^n.

2. Use laws of indices to combine powers of the same base.

(33)n=33n(3^3)^n=3^{3n}

Hence
312×33n=312+3n.3^{\frac12}\times 3^{3n}=3^{\frac12+3n}.

3. Equate the exponent to zero and solve for $n$.

Since 1=301=3^0,
312+3n=30.3^{\frac12+3n}=3^0.

Therefore,
12+3n=0\frac12+3n=0
3n=−123n=-\frac12
n=−16.n=-\frac16.

Answer

n=−16n=-\dfrac{1}{6}

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