Question

(2x+1)^3=729

Answer 1

\(\left(2x+1\right)^3=729\)

\(\Leftrightarrow\)\(\left(2x+1\right)^3=9^3\)

\(\Leftrightarrow\)\(2x+1=9\)

\(\Leftrightarrow\)\(2x=8\)

\(\Leftrightarrow\)\(x=4\)

Vậy...

Answer 2

\(\left(2x+1\right)^3=729\)

\(\Rightarrow2x+1=9\)

\(\Rightarrow2x=8\)

\(\Rightarrow x=4\)

Answer 3

(2x + 1)³ = 729

(2x + 1)³ = 9³

2x + 1     = 9

2x           = 9 - 1

x             = 8 : 2

x             = 4

Answer 4

( 2x + 1 )³ = 729

<=> ( 2x + 1 )³ = 9³

<=> 2x + 1 = 9

<=> 2x = 9 -1

<=> 2x = 8

<=> x = 8 : 2

<=> x = 4

Answer 5

\(\left(2x+1\right)^3=729\)

\(\Rightarrow\left(2x+1\right)^3=9^3\)

\(\Rightarrow2x+1=9\)

\(\Rightarrow2x=9-1\)

\(\Rightarrow2x=8\)

\(\Rightarrow x=8:2\)

\(\Rightarrow x=4\)

Vậy x = 4

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