y^2-9x^2+6x-1=(y^2-1)+( )=y^2-( )=6x-1-( )
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y^2-9x^2+6x-1=(y^2-1)+( )=y^2-( )=6x-1-( )
y^2-9x^2+6x-1=(y^2-1)+( )=y^2-( )=6x-1-( )
y^2-9x^2+6x-1=(y^2-1)+( )=y^2-( )=6x-1-( )
y^2-9x^2+6x-1=(y^2-1)+( 6x-9x²)=y^2-(3x-1 )^2=6x-1-(9x^2-y^2 )
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y^2-9x^2+6x-1=(y^2-1)+(-9x²+6x )=y^2-( 9x²-6x+1)=6x-1-(9x²-y² )
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