Question

  Tìm x:

a, 1+ (x-2)^2=5

b, 2^0+ 2^1+ 3x=  5-x

           Giups mk nhanh nhé!1

Answer 1

a) \(1+\left(x-2\right)^2=5\)

\(\Leftrightarrow1+\left(x-2\right)^2-4=5-1\)

\(\Leftrightarrow\left(x-2\right)^2=4\)

\(\Rightarrow\orbr{\begin{cases}x=4\\x=0\end{cases}}\)

b) \(2^0+2^1+3x=5-x\)

\(\Leftrightarrow3x+3=5-x\)

\(\Leftrightarrow3x+3-3=5-x-3\)

\(\Leftrightarrow3x=-x+2\)

\(\Leftrightarrow3x+x=-x+2+x\)

\(\Rightarrow x=\frac{1}{2}\)