- #1

- 18

- 0

I'm not suppose to use a calculator for this question, I tried taking the log of both sides but it required a calculator usage. Anyone know how to do this question by hand? The answer's -4 by the way

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter alliereid
- Start date

- #1

- 18

- 0

I'm not suppose to use a calculator for this question, I tried taking the log of both sides but it required a calculator usage. Anyone know how to do this question by hand? The answer's -4 by the way

- #2

Dick

Science Advisor

Homework Helper

- 26,263

- 619

- #3

- 18

- 0

- #4

Dick

Science Advisor

Homework Helper

- 26,263

- 619

- #5

- 18

- 0

Oh I'm sorry, you are right the answer is 4, I confused the answer I got which was -4 with the real answer. Yeah what I don't get is why it is 4, I got -4. It's a multiple choice question:

A. y = 4

B. x = 3

C. x = -3

D. y = -4

A. y = 4

B. x = 3

C. x = -3

D. y = -4

Last edited:

- #6

Dick

Science Advisor

Homework Helper

- 26,263

- 619

Then how did you get -4?

- #7

- 18

- 0

y = 2^(x+3) + 4

log2y = (x+3)+4

So does that not mean that y can't equal negative 4 since logs can't have a negative?

- #8

Dick

Science Advisor

Homework Helper

- 26,263

- 619

- #9

- 18

- 0

- #10

Dick

Science Advisor

Homework Helper

- 26,263

- 619

- #11

- 18

- 0

Alright, thanks for your help.

Share: