Exponent Laws Problem

Algebra Level 2

( 3 2 ) 6 × ( 3 4 ÷ 3 2 ) = 3 x \large (3^2)^6×(3^4÷3^2)=3^x

Solve for x x without using a calculator.


The answer is 14.

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5 solutions

3 x = ( 3 2 ) 6 × ( 3 4 ÷ 3 2 ) = 3 2 × 6 3 4 3 2 = 3 12 + 4 2 = 3 14 x = 14 \begin{aligned} 3^x & = (3^2)^6 \times (3^4 \div 3^2) \\ & = 3^{2\times 6}3^43^{-2} \\ & = 3^{12+4-2} \\ & = 3^{14} \\ \implies x & = \boxed{14} \end{aligned}

Marta Reece
Jun 1, 2017

2 × 6 + 4 2 = 14 2\times6+4-2=14

Eric Taylor
Jun 1, 2017

Due to exponent laws, ( 3 2 ) 6 × ( 3 4 ÷ 3 2 ) (3^2)^6 × (3^4÷3^2) is the same as 3 2 × 6 × 3 4 2 3^{2×6}×3^{4-2} which equals 3 12 + 2 3^{12+2} which equals 3 14 3^{14}

Therefore, x x is 14.

Using a calculator it is obvious that the answer is 14

Matin Naseri
Mar 18, 2018

(3 2 ) 6 = \text{(3}^{2})^{6}= 3 2 × 6 = \text{3}^{2×6}= 3 12 \text{3}^{12} .

3 4 3 2 = 3 4 2 = 3 2 \frac{{3}^{4}}{{3}^{2}}={\text{3}^{4-2}}={\text{3}^{2}} .

Now , 3 12 × 3 2 = 3 12 + 2 = 3 14 \text{3}^{12}×{\text{3}^{2}}={\text{3}^{12+2}}={\text{3}^{14}} □.

\therefore the answet is 3 14 \color{#3D99F6}{\text{3}^{14}} .

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