Question

When will 30x(1.2^x)=45+3x

Answer 1

Help

Answer 2

Ohh its not 30x it's just 30

Answer 3

is there answer choices?

Answer 4

No

Answer 5

It's hard

Answer 6

oh okay. and yeah i have been studying these in class but i forgot.:/

Answer 7

Ohh ok

Answer 8

Me too

Answer 9

Oh. Sorry I wasn't much help.

Answer 10

It's ok

Answer 11

is that \[30(1.2^x)=45+3x\]

Answer 12

Yeah

Answer 13

So do you think you need to do?

Answer 14

Well, I would graph the two functions (on desmos.com for example), and see where they interect.

Answer 15

(where - at which value of x)

Answer 16

yeah! but there is an algebraic way

Answer 17

i already looked at the graphs
two solution exist for this

Answer 18

xapproachesinfinity is right. In the situation that no calculators are allowed and this is a test question, or in the situation that you want to algebraically check your work, knowing how to do the algebra on this one can go a long way... :D

Answer 19

If you are using the graph method, and there are TWO solutions, you will need to plug them in each and see which value makes a true statement. ^^

Answer 20

let's how it is done algebraically

Answer 21

i would say algebra alone won't do!
then let's see what you know?
have you taken calculus

Answer 22

so what do you say? i need to confirm what you know
with calculus we can figure out this problem

Answer 23

we just need to let \[f(x)=10(1.2)^x -x-15\]