Question

x^2-25+x(x+5)=0

Ko viết tắt 

Answer 1

x² - 25 + x ( x + 5 ) = 0

( x + 5 ) ( x - 5 ) + x ( x + 5 ) = 0 

( x + 5 ) ( x - 5 + x ) = 0

( x + 5 ) ( 2x - 5 ) = 0

\(\left\{{}\begin{matrix}x+5=0\\2x-5=0\end{matrix}\right.\)

\(\left\{{}\begin{matrix}x=-5\\x=\dfrac{5}{2}\end{matrix}\right.\)

Answer 2

x= 5/2
x= -5

Answer 3

² - 25 + x ( x + 5 ) = 0

( x + 5 ) ( x - 5 ) + x ( x + 5 ) = 0 

( x + 5 ) ( x - 5 + x ) = 0

( x + 5 ) ( 2x - 5 ) = 0

{x+5=02x−5=0{x+5=02x−5=0