Question

1/(x-40. ( x-7)=0

2/ (x-12).(x+13)=0

3/(2-x-4).(3.x-9)=0

Answer 1

(x-40)(x-7)=0

=>x-40=0 hoặc x-7=0

=>x=40   hoặc x=7

tíc mình nha

Answer 2

1.\(\left(x-40\right)\left(x-7\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-40=0\\x-7=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=40\\x=7\end{cases}}\)

2. \(\left(x-12\right)\left(x+13\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-12=0\\x+13=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=12\\x=-13\end{cases}}\)

3. \(\left(2-x-4\right)\left(3x-9\right)=0\)

\(\Rightarrow\orbr{\begin{cases}2-x-4=0\\3x-9=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=-2\\x=3\end{cases}}\)