Question 209408
3xy^2 +11xy -20x,,,,if  we  factor  common  term (x)
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x(3y^2 +11y-20)
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looking  at  second  factor
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last  term  is  (-), therefore  factors  have  different  signs, and second  term  is  difference  of  factors
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Middle  term  is  (+),  therefore,  largest  factor  is  (+)
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factor  of  1st  term  is,,,  1*3
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factors  of  last  term  are,,,1*20,,2*10,,,4*5
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x(3y-4)(y+5),,,,,answer
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check  by  multiplying  factors
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(3xy -4x)(y+5) 
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3xy^2 +15xy -4xy -20x
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3xy^2 +11xy -20x,,,,,,,ok
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