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\(a,\Leftrightarrow x\left(x+5\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-5\end{matrix}\right.\\ b,\Leftrightarrow3x\left(x-1\right)+\left(x-1\right)=0\\ \Leftrightarrow\left(x-1\right)\left(3x+1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=1\\x=-\dfrac{1}{3}\end{matrix}\right.\\ c,\Leftrightarrow\left(x+2\right)\left(2x-3\right)=0\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=\dfrac{3}{2}\end{matrix}\right.\)
a) (x+2)(x+1-x+1)=0
\(\Leftrightarrow\) (x+2)\(\times\) 2 = 0
\(\)\(\Leftrightarrow\)x+2 =0\(\Leftrightarrow\) x =-2
b) \(x^3-2x^2+x^2+x-2\)
\(\Leftrightarrow x^3-x^2+x-2=0\)
`@` `\text {Ans}`
`\downarrow`
`1,`
`x^2 - 9 = 0`
`<=> x^2 = 0 + 9`
`<=> x^2 = 9`
`<=> x^2 = (+-3)^2`
`<=> x = +-3`
Vậy, `S = {3; -3}`
`2,`
`25 - x^2 = 0`
`<=> x^2 = 25 - 0`
`<=> x^2 = 25`
`<=> x^2 = (+-5)^2`
`<=> x = +-5`
Vậy,` S= {5; -5}`
`3,`
`-x^2 + 36 = 0`
`<=> -x^2 = 0 - 36`
`<=> -x^2 = -36`
`<=> x^2 = 36`
`<=> x^2 = (+-6)^2`
`<=> x = +-6`
Vậy, `S= {6; -6}`
`4,`
`4x^2 - 4 = 0`
`<=> 4x^2 = 0+4`
`<=> 4x^2 = 4`
`<=> x^2 = 4 \div 4`
`<=> x^2 = 1`
`<=> x^2 = (+-1)^2`
`<=> x = +-1`
Vậy, `S= {1; -1}`
`@` `\text {Kaizuu lv uuu}`
a: \(x\in\left\{0;25\right\}\)
c: \(x\in\left\{0;5\right\}\)
a) x = 1; x = - 1 3 b) x = 2.
c) x = 3; x = -2. d) x = -3; x = 0; x = 2.
a. x( x+ 3)= 0
⇔ x= 0 hoặc x+ 3= 0
⇔ x= 0 x = -3
b. x( 2x− 1)+ 2( 2x− 1) =0
⇔ ( 2x− 1)(x+ 2) =0
⇔ 2x− 1 =0 hoặc x+ 2 =0
⇔ 2x =1 x = -2
⇔ x =\(\dfrac{1}{2}\) x = -2
3) \(x\left(x-4\right)+\left(x-4\right)^2=0\Leftrightarrow\left(x-4\right)\left(x+x-4\right)=0\Leftrightarrow2\left(x-4\right)\left(x-2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-4=0\\x-2=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4\\x=2\end{matrix}\right.\)
$(x^2-2)^2+4(x-1)^2-4(x^2-2)(x-1)=0$
$\Leftrightarrow(x^2-2)^2-4(x^2-2)(x-1)+4(x-1)^2=0$
$\Leftrightarrow(x^2-2)^2-2\cdot(x^2-2)\cdot2(x-1)+[2(x-1)]^2=0$
$\Leftrightarrow[(x^2-2)-2(x-1)]^2=0$
$\Leftrightarrow(x^2-2-2x+2)^2=0$
$\Leftrightarrow(x^2-2x)^2=0$
$\Leftrightarrow x^2-2x=0$
$\Leftrightarrow x(x-2)=0$
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x-2=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=2\end{matrix}\right.\)
Vậy: $x\in\{0;2\}$.
\(\left(x-1\right)\left(x+2\right)-x-2=0\)
\(\left(x-1\right)\left(x+2\right)-\left(x+2\right)=0\)
\(\left(x-1-1\right)\left(x+2\right)=0\)
\(\left(x-2\right)\left(x+2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x+2=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=2\\x=-2\end{cases}}\)
\(\left(x-1\right)\left(x+2\right)-x-2=0\)
\(\left(x-1\right)\left(x+2\right)-\left(x+2\right)=0\)
\(\left(x+2\right)\left(x-1-1\right)=0\)
\(\left(x+2\right)\left(x-2\right)=0\)
\(\Rightarrow x+2=0\)hoặc\(x-2=0\)
\(x=-2\)hoặc\(x=2\)