Question 689441
Using the intermediate value theorem, show that the polynomial has a real zero between 1 and 2. 
f(x)=x^3-x-1
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f(1) = 1-1-1 = -1
f(2) = 8-2-1 = 5
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Since f is a continuous function and is below the x-axis
when x = 1 but above the x-axis when x = 2, f must be zero
for some value between x = 1 and x = 2.
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cheers,
Stan H.