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Let, f(x)=x3−13x2+32x+20f(x)=x3−13x2+32x+20



f(−1)<0f(−1)<0f(0)>0f(0)>0, which shows there is a root between x=−1x=−1 and x=0x=0

f(4)>0f(4)>0f(5)<0f(5)<0, which shows there is a root between x=4x=4 and x=5x=5

f(9)<0f(9)<0f(10)>0f(10)>0, which shows there is a root between x=9x=9 and x=10

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