Question

(x+5).(x-4)=0

Answer 1

\(\left(x+5\right).\left(x-4\right)=0\)

\(\Rightarrow\left[\begin{matrix}x+5=0\\x-4=0\end{matrix}\right.\)

\(\Rightarrow\left[\begin{matrix}x=0-5\\x=0+4\end{matrix}\right.\)

\(\Rightarrow\left[\begin{matrix}x=-5\\x=4\end{matrix}\right.\)

\(\Rightarrow x=\left\{-5;4\right\}\)

Answer 2

(x + 5).(x - 4) = 0

\(\Rightarrow\) x + 5 = 0 hoặc x - 4 = 0

Nếu x + 5 = 0

x = 0 - 5

x = -5

Nếu x - 4 = 0

x = 0 + 4

x = 4

Vậy x \(\in\) { -5 ; 4 }

Answer 3

x=-5;hoặc x=4

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Answer 4

suy ra x+5=0 suy ra x=0-5=-5

hoặc x-4=0 suy ra x=0+4=4

vay x=4 hoac -5