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9x^2+6x+1-25y^2

(3x)^2+2*3x*1+(1)^2-(5y)^2

(3x+1)^2-(5y)^2

{(3x+1)+5y}{(3x+1)-5y}

(3x+5y+1)(3x-5y+1)

(3x)^2+2*3x*1+(1)^2-(5y)^2

(3x+1)^2-(5y)^2

{(3x+1)+5y}{(3x+1)-5y}

(3x+5y+1)(3x-5y+1)

(3x)^2+2*3x*1+(1)^2-(5y)^2

(3x+1)^2-(5y)^2

(3x+5y+1)(3x-5y+1)