Question

Tìm x :

\(\left(x-1\right)\left(x+3\right)=0\)

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

Answer 1

\(\left(x-1\right)\left(x+3\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x-1=0\\x+3=0\end{array}\right.\Leftrightarrow\left[\begin{array}{nghiempt}x=1\\x=-3\end{array}\right.\)

Vậy \(x\in\left\{1;-3\right\}\)

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

\(\Leftrightarrow\left[\begin{array}{nghiempt}x-4=0\\x+5=0\end{array}\right.\Leftrightarrow\left[\begin{array}{nghiempt}x=4\\x=-5\end{array}\right.\)

Vậy \(x\in\left\{4;-5\right\}\)

Answer 2

\(\left(x-1\right)\left(x+3\right)=0\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=0+1\\x=0-3\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=1\\x=-3\end{array}\right.\)

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

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

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

 

 

Answer 3

1. ( x - 1 ) ( x + 3 ) = 0

       \(\Rightarrow\) x - 1 = 0           hoặc         x + 3 =0

            x = 1                                   x = -3

        Vậy x = 1 ; x = -3

   2. (x - 4 ) ( x + 5 ) = 0

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

              x = 4                                             x = -5

                  Vậy x = 4 ; x = -5

Answer 4

     ( x - 1) ( x+ 3) = 0

TH1:  ( x - 1) = 0 \(\Rightarrow\) x = 1

TH2 : (x - 3 ) = 0 \(\Rightarrow\) x = 3

Answer 5

có nhiều Th mà

Answer 6

          ( x - 4 ) ( x+ 5) =0

TH1: (x - 4) = 0 \(\Rightarrow\) x = 4

TH2: (x + 5) = 0 \(\Rightarrow\) x = -5

Answer 7

\(\left(x-1\right)\left(x+3\right)=0\)

\(\Rightarrow x-1=0\) hoặc \(x+3=0\)

+) \(x-1=0\Rightarrow x=1\)

+) \(x+3=0\Rightarrow x=-3\) 

Vậy x = 1 hoặc x = -3

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

\(\Rightarrow x-4=0\) hoặc \(x+5=0\)

+) \(x-4=0\Rightarrow x=4\)

+) \(x+5=0\Rightarrow x=-5\)

Vậy x = 4 hoặc x = -5