Question

If 5%-1 +5x+1 = 130, then xis equal to​

Answer 1

Answer:

Try approximation techniques. Let f(x) = 5^(x+1) + 5x. You want f(x) = 150.First, try x = 2. Then f(2) = 5^3 + 10 = 135. Since this is too small, try x = 3. Here, you have f(3) = 5^4 + 15 = 640, which is much too large. This tells you the x you want is between 2 and 3, much closer to 2 than to 3.

Try then x = 2.1. Using a calculator, you find f(2.1) = 5^3.1 + 10.5 = 157.33.

So now x lies between 2 and 2.1, apparently closer to 2.1 than to 2. I swould now try x = 2.07, and continue in this manner until I obtained some f(x) very close to 150. Try it out!

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Step-by-step explanation:

Answer 2

Answer:

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