Question 195060
( x^2 -3x -10 ) / x^2 -x-20) 
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factoring
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{ [  ( x-5) (x+2) ] / [ (x-5) (x+4 ]
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(x+2)  /  (x+4)
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checking  ,,,let  x=1,  check  original  and  answer
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original,,,(1 -3-10) / (1-1-20)  ,,,  -12/ -20  =  3/5
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answer  ,,,,  3/5,,,,ok