1,Tim x: 2 ^x+2^x+3=144

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1. `2^x+2^[x+3]=144`

   `⇒ 2^x+2^x . 2^3=144`

   `⇒ 2^x(1+2^3)=144`

   `⇒ 2^x . 9 =144`

   `⇒ 2^x = 144 ÷ 9`

   `⇒ 2^x = 16`

   `⇒ 2^x = 2^4`

   `⇒ x = 4`

   Vậy `x = 4`

   Xin hay nhất !

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