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OpenStudy (anonymous):
Multiply and simplify: x+11/x+3* x^2-9/x^2+20x+99
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OpenStudy (campbell_st):
factorise the 2nd fraction (x+3)(x-3)/(x +9)(x +11) the problem is now [(x + 11)(x+3)(x-3)]/[(x + 3)(x + 9)(x + 11) common factors of ( x +3)(x+11) can be cancelled leaving (x -3)/(x+9)
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