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Prove the equation has at least one real root

http://integralcalc.com/ Learn how to use the Intermediate Value Theorem to prove that the function as at least one real root. To do this, you'll need to look at the range of each term in the function, and then use that information to pinpoint values you should focus on. You'll need to look for points above and below the x-axis. If you can prove that a point exist below the x-axis, and that another point exists above the x-axis, and you know that the function is continuous between those points, then you can use the Intermediate Value Theorem to prove that the function must assume a value of zero somewhere between those two points. In other words, the function must have a real root between these points.
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