( x + 4 ) 2 - 23 = 77
( x + 4 ) 2 = 77 + 23
( x + 4 ) 2 = 100
( x + 4 ) 2 = 102
=> x + 4 = 10
x = 10 - 4
x = 6
Vậy x = 6
(x+4)2-23=77
(x+4)2-23=77-23
(x+4)2 =54
(x+4)2 =54:2
(x+4) =27
x=27-4
x=23
\(\left(x+4\right)^2-23=77\)
\(\left(x+4\right)^2=77+23\)
\(\left(x+4\right)^2=100\)
\(\left(x+4\right)^2=10^2\)
\(\Rightarrow x+4=10\)
\(\Rightarrow x=6\)
vay \(x=6\)
( x + 4 ) \(^2\)- 23 = 77
( x + 4 ) \(^2\) = 77 + 23
( x + 4 ) \(^2\) = 100
( x + 4 ) \(^2\) = 10 \(^{^2}\)
x = 10 - 4
x = 6
( x + 4 )2 - 23 = 77
( x + 4 )2 = 77 + 23
( x + 4 )2 = 100
( x + 4 )2 = 102
=> x + 4 = 10
x = 10 - 4
x = 6
