Question

giúp mik câu c d e f thôi ạ :))

Answer 1

a: \(\left(x-1.2\right)^2=4\)

\(\Leftrightarrow\left[{}\begin{matrix}x-1.2=2\\x-1.2=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3.2\\x=-0.8\end{matrix}\right.\)

b: Ta có: \(\left(x+1\right)^3=-125\)

\(\Leftrightarrow x+1=-5\)

hay x=-6

Answer 2

c) 3^(4-x)=27

3^(4-x) = 3^3

4-x = 3

x = 1