Question

Giúp mình với

(4-x)(2-x)=2(4-x)

Answer 1

(4-x)(2-x)=2(4-x)

8-4x-2x+x^2=8-2x

8-8-4x-2x+2x+x^2=0

-4x+x^2=0

x(-4+x)=0

\(\Rightarrow\hept{\begin{cases}x=0\\-4+x=0\end{cases}\Rightarrow\hept{\begin{cases}x=0\\x=4\end{cases}}}\)

Answer 2

(4 - x)(2 - x) = 2.(4 - x)

2 - x = 2.(4 - x) : (4 - x)

2 - x = 2

x = 2 - 2 

x = 0