Giúp mik với mn ơi ơi

`1,`

`(x+3)^2 -(x+2)(x-2)=0`

`=>` `x^2 + 6x +9 - x^2 +4=0`

`=>` `6x +13=0`

`=>` `6x=-13`

`=>` `x=-13/6`

`2,` 

`5x(x-3)=5x^2 +7x-5`

`=>` `5x^2 -15x -5x^2 -7x +5 =0`

`=>` `-22x+5=0`

`=>` `-22x=-5`

`=>` `x=(-5):(-22) =5/22`

`3,`

`9x^2 -(x-4)^2=0`

`=>` `(3x-x+4)(3x+x-4)=0`

`=>` `(2x+4)(4x-4)=0`

`=>` `2(x+2)4(x-1)=0`

`=>` `8(x+2)(x-1)=0`

`=>` $\left[\begin{matrix} x+2=0\\ x-1=0\end{matrix}\right.$

`=>` $\left[\begin{matrix} x=-2\\ x=1\end{matrix}\right.$

Vậy `x in {-2;1}`

`4,` 

`(2x-1)^2 -9=16`

`=>` `(2x-1)^2 -9-16=0`

`=>` `(2x-1)^2 -25=0`

`=>` `(2x-1-5)(2x-1+5)=0`

`=>` `(2x-6)(2x+4)=0`

`=>` `2(x-3)2(x+2)=0`

`=>` `4(x-3)(x+2)=0`

`=>` $\left[\begin{matrix} x-3=0\\ x+2=0\end{matrix}\right.$

`=>` $\left[\begin{matrix} x=3\\ x=-2\end{matrix}\right.$

Vậy `x in {-2;3}`

`5,`

`10x^2 -x(x+2) +8x+1=0`

`=>` `10x^2 - x^2 -2x +8x +1=0`

`=>` `9x^2 +6x+1=0`

`=>` `(3x)^2 + 2.3x.1 +1^2=0`

`=>` `(3x+1)^2=0`

`=>` `3x+1=0`

`=>` `3x=-1`

`=>` `x=-1/3`