9(x+1)^2-4(x-1)^2
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9(x+1)^2-4(x-1)^29(x+1)^2-4(x-1)^29(x+1)^2-4(x-1)^29(x+1)^2-4(x-1)^2=9(x^2+2x+1)-4(x^2-2x+1)=9x^2+18
9(x+1)^2-4(x-1)^2
9(x+1)^2-4(x-1)^2
9(x+1)^2-4(x-1)^2
9(x+1)^2-4(x-1)^2
=9(x^2+2x+1)-4(x^2-2x+1)
=9x^2+18x+9-4x^2+8x-4
=5x^2+26x+5
(5X+1)(X+5)
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