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Check whether x+1 is a factor of 5x³+x²-5x-1 using factor theorem. |
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Answer» 5x³+x²-5x-1. x+1=0. x=-1. 5(-1)³+(-1)²-5(-1)-1. 5(-1)+(1)+5-1. (Because -×-=+). -5+1+5-1. (Because +×-=-). 0. (Because +×-=- & -×+=- so, -5+5 & +1-1 will CANCEL). I think this is your answer. |
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