giup mik vs Tim x: a, (2x-1)^3=125 b,3^x-1=27 c,26x:4=32 d,3^x:3^2=243 e,6x^3-8=40 h,4^2x-1:4=16

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1. a, `(2x-1)^3`=125

   => `(2x-1)^3` = `5^3`

   => 2x-1 = 5

   => 2x = 6

   => x = 3

   b,`3^(x-1)`=27

   => `3^(x-1)` = `3^3`

   => x – 1 = 3

   => x = 4

   c,26x : 4=32

   => 26x = 128

   => x = `128/26`

   => x = `64/13`

   d,`3^x` : `3^2`=243

   => 3^(x-2) = `3^5`

   => x – 2 = 5

   => x = 7

   e,6`x^3` – 8=40

   =>6`x^3` = 48

   => `x^3` = 8

   => `x^3` = `2^3`

   => x = 2

   h,`4^(2x- 1)` : 4=16

   => `4^(2x- 1)` = 64

   => `4^(2x- 1)` = `4^3`

   => 2x – 1 = 3

   => 2x = 4

   => x = 2

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2. a) `(2x-1)³=125`

   `⇒ (2x-1)³=5³`

   `⇒ 2x-1=5`

   `⇒ 2x=6`

   `⇒ x=3`

   b) `3^(x-1)=27`

   `⇒ 3^(x-1)=3^3`

   `⇒ x-1=3`

   `⇒ x=4`

   d) `3^x :3^2=243`

   `⇒ 3^x :3²=3^5`

   `⇒ 3^x=3³`

   `⇒ x=3`

   e) `6x^3-8=40`

   `⇒ 6x^3=48`

   `⇒ x^3=8`

   `⇒ x^3=2^3`

   `⇒ x=2`

   h) `4^(2x-1):4=16`

   `⇒ 4^(2x-1)=64`

   `⇒ 4^(2x-1)=4^3`

   `⇒ 2x-1=3`

   `⇒ 2x=4`

   `⇒ x=2`

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