The function f(x)=2x^3-4x+1 has the output value 12 for exactly one input value of x. Between which of the following pairs of numbers does this input value of x lie?
2.08 and 2.09
2.10 and 2.11
2.12 and 2.13
2.14 and 2.15
2.16 and 2.17
2.19 and 2.20
None of the above
Please explain. Thank you!

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How do I do this do I plug the numbers in?

By plugging them in for x

So plug in for example 2(2.08)^3-4(2.08)+1=10.68 and then 2(2.09)^3-4(2.09)+1=10.89

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