Posted by **Kellie** on Tuesday, January 16, 2007 at 2:40am.

I have 2 problems I need help with both I have narrowed it down to 2 possible answers but can't decide which one is right. The first problem log subscript 5 (2x+3)=2 the choices a)13/2 and b) 14. The next problem 8^x = 16^x+2 the choices a)8 and b)-8. Help please!

If log5 z = 2 then z=25

2x+3=25 x=you do it.

8^x = 16^(x+2)

8^x = 2^x+2 * 8^x+2

divide by 8^x

1=64*2^(x+2)

1/64 = 2^(x+2)

1/2^6 = 2^(x+2)

2^-6 = 2^(x+2)

now take the log base 2 of each side.

## Answer This Question

## Related Questions

- Math - I have 2 problems I need help with both I have narrowed it down to 2 ...
- Precalculus - I'm studying for my precalc exam and have completed 42 practice ...
- Algebra 2 once more - I have more answers that I would like checked. Also, there...
- MATH - I have 2 questions the first I have narrowed down to 2 possible solutions...
- confirm math answers - I have 3 problems I need my answers confirmed for. The ...
- Math - What is the real value of x in the equation log(subscript 2)24-log(...
- physics - A particle of mass m starts from x subscript o = 0 m with V subscript ...
- physics - A particle of mass m starts from x subscript o = 0 m with V subscript ...
- Math Exam Tuesday - My friend swears by your site so I thought I'd confirm some ...
- Math - The problem 8^x = 16^x+2 the choices a)8 and b)-8. Help please! Given ...

More Related Questions