Ae nào giúp e được ko ạ e cảm ơn

`color{pink}{@npanh}`

`a)x^2+8x+16=0`

`<=>(x+4)^2=0`

`<=>x+4=0`

`<=>x=-4`

Vậy `x=-4`

`b)x^3-3x^2+3x-1=0`

`<=>(x-1)^3=0`

`<=>x-1=0`

`<=>x=1`

Vậy `x=1`

`c)9x^2-12x+4=0`

`<=>(3x-2)^2=0`

`<=>3x-2=0`

`<=>3x=2`

`<=>x=2/3`

Vậy `x=2/3`

`d)(x-3)^2-(4-x)^2=0`

`<=>(x-3)^2-(x-4)^2=0`

`<=>(x^2-6x+9)-(x^2-8x+16)=0`

`<=>x^2-6x+9-x^2+8x-16=0`

`<=>2x=7`

`<=>x=7/2`

Vậy `x=7/2`

`3B`

`a)25x^2+10x+1=0`

`<=>(5x+1)^2=0`

`<=>5x+1=0`

`<=>5x=-1`

`<=>x=-1/5`

Vậy `x=-1/5`

`b)x^2-20x=-100`

`<=>x^2-20x+100=0`

`<=>(x-10)^2=0`

`<=>x-10=0`

`<=>x=10`

Vậy `x=10`

`c)8x^3-12x^2+6x-1=0`

`<=>(2x-1)^3=0`

`<=>2x-1=0`

`<=>2x=1`

`<=>x=1/2`

Vậy `x=1/2`

`d)(3x-1)^3+(3x+1)^3=0`

`<=>27x^3-9x^2+9x-1+27x^3+9x^2+9x+1=0`

`<=>54x^3+18x=0`

`<=>18x(3x^2+1)=0`

`TH1:18x=0`

`<=>x=0`

`TH2:3x^2+1=0`

`<=>3x^2=1`

`<=>x^2=1/3`(Không có giá trị thỏa mãn)

Vậy `x=0`