Question

What is the exact value of x in the exponential equation 25.3 + e7x = 97.3?

Answer 1

@jabez177

Answer 2

e^7x*

Answer 3

start by subtracting 25.3 from both sides

Answer 4

what do you get?

Answer 5

e^7x+72

Answer 6

No, e^7x = 72 correct?

Answer 7

oh ok

Answer 8

whats next

Answer 9

Now take the natural log of both sides

Answer 10

i forgot how to do that

Answer 11

Just take the Natural Log of both sides......

Lne^7x = Ln72 OK?

Answer 12

how do i put the e in the calculator

Answer 13

it give me error

Answer 14

Not yet, you're jumping the gun.

You have to use one of the log rules on the LHS

Ln(a^b) = bLna

Answer 15

im lost i dont remember learning that last part. i dont know what im doing

Answer 16

How about this

Log(a^b) = b Loga

Answer 17

x = ln 72 − 7
x=In10.3/7
x=In72/7
x=In72/In7
are the choices

Answer 18

Yes, its definitely one of those choices.

Answer 19

LHS = Ln(e^7x) = ?

Answer 20

use what i've given you

Answer 21

okay hold on

Answer 22

I Dont Know What to do.

Answer 23

i need to find the value of x not solve the equation

Answer 24

If Ln(a^b) = bLna then what does Ln(e^7x) = ?

Answer 25

In order to find the value of x you first need to re-arrange the equation to make x the subject

Answer 26

Goodnight