`(3x-1)^2-(x+5)^2=0`
`<=>(3x-1-x-5)(3x-1+x+5)=0`
`<=>(2x-6)(4x+4)=0`
`<=>(x-3)(x+1)=0`
`<=>[(x=3),(x=-1):}`
<=> 9x^2 - 6x + 1 - x^2 - 10x - 25 = 0
<=> 8x^2 -16x - 24 =0
<=> 8x^2 - 24x + 8x - 24 =0
<=> 8[x(x-3) + (x-3)] = 0 <=> x-3 = 0 => x=3
x+1 = 0 x=-1