Question

Tìm số hữu tỉ x biết \(\left(x-1\right)^5=-243\)

Answer 1

\((x-1)^5=-243\)

\(\Rightarrow x-1=(-3)^5\)

\(\Rightarrow x-1=-3\)

\(\Rightarrow x=-3+1\)

\(\Rightarrow x=-2\)

Answer 2

\(\left(x-1\right)^5=-243\)

\(\Rightarrow\left(x-1\right)^5=\left(-3\right)^5\)

\(\Rightarrow x-1=-3\)

\(\Rightarrow x=-3+1\)

\(\Rightarrow x=-2\)

Answer 3

\(\left(x-1\right)^5=-243\)
\(\left(x-1\right)^5=-3^5\)

\(x-1=-3\)

\(x=-3+1\)

\(x=-2\)