\(\left(x-1\right)^3-3=5\\ \Rightarrow\left(x-1\right)^3=8\\ \Rightarrow x-1=2\\ \Rightarrow x=3\)
(x-1)3 = 5 + 3 = 8
Ta thấy 8 = 23 ( 2 . 2 . 2 = 8 ) nên (x-1)3 = 23 . Để x - 1 = 2 thì x = 2 + 1 = 3
Vậy suy ra x = 3
\(\left(x-1\right)^3-3=5\)
\(\Rightarrow\left(x-1\right)^3=8\)
\(\Rightarrow\left(x-1\right)^3=2^3\)
\(\Rightarrow x-1=2\)
\(\Rightarrow x=3\)
`(x-1)^3-3=5`
`<=>(x-1)^3 = 5+3`
`<=>(x-1)^3 = 8`
`<=>(x-1)^3 = 2^3`
`<=> x-1 = 2`
`<=> x = 2+1`
`<=> x = 3`
Vậy `x = 3`
