7^2x-^6=49 3x-^3-3^2=2.3^2 (x+2)(x-4)=0 7^2x-^6=49

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1. `7^2x^6=49`

   `⇔49x^6=49`

   `⇔x^6=1`

   `⇔x=±1`

   `(3x)^3-3^2=2.3^2`

   `⇔(3x)^3=2.3^2+3^2`

   `⇔(3x)^3=3^3`

   `⇔3x=3`

   `⇔x=1`

   `(x+2)(x-4)=0`

   `⇔`\(\left[ \begin{array}{l}x+2=0\\x-4=0\end{array} \right.\) 

   `⇔`\(\left[ \begin{array}{l}x=-2\\x=4\end{array} \right.\) 

    

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