Question

Tìm x

(7x-11)³=2⁵.5²+200

Answer 1

( 7x - 11 )³ = 2⁵ . 5² + 200
\(\Rightarrow\)( 7x - 11 )³ = 32 . 25 + 200
\(\Rightarrow\)( 7x - 11 )³ = 800 + 200 
\(\Rightarrow\)( 7x - 11 )³ = 1000
\(\Rightarrow\)( 7x - 11 )³ = 10³
\(\Rightarrow\)7x - 11 = 10
\(\Rightarrow\)7x = 10 + 11 = 21
\(\Rightarrow\)x = 21 : 7
\(\Rightarrow\)x = 3

Answer 2

( 7x - 11 )³ = 2⁵ . 5² + 200

( 7x - 11 )³ = 32 . 25 + 200

( 7x - 11 )³ = 800 + 200

( 7x - 11 )³ = 1000

( 7x - 11 )³ = 10³

7x - 11 = 10

7x = 10 + 11

7x = 21

  x = 21 : 7

  x = 3

Answer 3

\(\left(7x-11\right)^3=2^5.5^2+200\)

\(\left(7x-11\right)^3=32.25+200\)

\(\left(7x-11\right)^3=800+200\)

\(\left(7x-11\right)^3=1000\)

\(\left(7x-11\right)^3=10^3\)

\(7x-11=10\)

\(7x=11+10\)

\(7x=21\)

\(x=21:3\)

\(x=7\)