(b-5)(b+5)(b^2+25)-(b^2-9)^2 = (b^2-25)(b^2+25)-(b^2-9)^2 = b^4-625 - b^4+18b^2-81 = 18b^2-706 = 18 * 1/9 - 706 = -704
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(b-5)(b+5)(b^2+25)-(b^2-9)^2 = (b^2-25)(b^2+25)-(b^2-9)^2 = b^4-625 - b^4+18b^2-81 = 18b^2-706 = 18 * 1/9 - 706 = -704