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23 votes
23 votes
Need help on this!!!

Need help on this!!!-example-1
User RobbR
by
3.0k points

2 Answers

26 votes
26 votes

Answer:

Explanation:

The key to solving this equation is knowing how to "undo" a natural log. Just like square roots are "undone" by squaring, and cubing "undoes" a cubed root, raising a natural log to the base of e, Euler's number, undoes a natural log. Because this is an equation you have to raise both sides of it to the base of e:


e^(ln(x+3))=e^5

That leaves us on the left with simply

x + 3

On the right we have a constant. e is not a variable, it is a number. You can find its value on your calculator. Solving for x:


x=e^5-3 and


e^5=148.4131591, so

x = 148.4131591 - 3 and

x = 145.4132, the first choice listed.

User Madhura Jayaratne
by
3.0k points
14 votes
14 votes

Answer:

7.8391

Explanation:

User Mano Marks
by
2.7k points