(3x-1)²=
(3a-1)(3a-1)=
3x*3x+3x(-1)+3x(-1)+(-1)(-1)=
9x²-3x-3x+1=
9x²-6x+1
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Verified answer
(3x-1)²=
(3a-1)(3a-1)=
3x*3x+3x(-1)+3x(-1)+(-1)(-1)=
9x²-3x-3x+1=
9x²-6x+1