Question

7x(x-20)+10(x-20)=0
tìm x
giúp với mọi người ơi 

Answer 1

\(\Leftrightarrow\left[{}\begin{matrix}x=20\\x=-\dfrac{10}{7}\end{matrix}\right.\)

Answer 2

\(\left(x-20\right).\left(7x+10\right)=0\)
\(=>\left[{}\begin{matrix}x-20=0\\7x+10=0\end{matrix}\right.\)
\(=>\left[{}\begin{matrix}x=20\\x=-\dfrac{10}{7}\end{matrix}\right.\)

Answer 3

7x(x-20)+10(x-20)=0

(x-20)x(7x+10)=0

(x-20)=0 hoặc (7x+10)=0

x=20 hoặc 7x=-10

x=20 hoặc x=-10/7