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Because: (9-x)(9-x) = 81-18x+x^2
The given expression can be simplified to: 8x squared +9
9x2 - 18x + 99(x2 - 2x + 1)==========
5(x^2 + 9)
(2x+3)/(10x2+21x+9)Factor the quadratic expression in the denominator:(2x+3)/(5x+3)(2x+3)which becomes:1/(5x+3) or (5x+3)-1