Math

posted by .

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.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Precalculus

    I'm studying for my precalc exam and have completed 42 practice problems. I have 3 I need to answer that I can't. Please help. What is the base of the function G(x) = log subscript b x if it's graph has points (16,4)?
  2. Math Exam Tuesday

    My friend swears by your site so I thought I'd confirm some of my more difficult answers for my math practice exam. Is the solution set for 8^x = 16^ x+2 is it -2?
  3. confirm math answers

    I have 3 problems I need my answers confirmed for. The solution for log subscript 3 1/9 = x is the solution -1/2?
  4. Math

    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 …
  5. MATH

    I have 2 questions the first I have narrowed down to 2 possible solutions the second has 3. What is the solution to log sub 5 (2x+3)=2 a)13/2 or b)14?
  6. Math

    The problem 8^x = 16^x+2 the choices a)8 and b)-8. Help please! Given that information I want to say the answer is -8 ?
  7. Algebra 2 once more

    I have more answers that I would like checked. Also, there is one that I'm really confused about. I appreciate any help. :) Rewrite as the log of a single number. 1) 8 ln 2 = ln(2^8) 2) log 42 - log 6 = log 36 (I think this one may …
  8. Math

    What is the real value of x in the equation log(subscript 2)24-log(subscript 2)3=log(subscript 5)x?
  9. physics

    A particle of mass m starts from x subscript o = 0 m with V subscript o > 0 m/s. The particle experiences the variable force F subscript x = F subscript o sin (cx) as it moves to the right along the x-axis, where F subscript o and …
  10. physics

    A particle of mass m starts from x subscript o = 0 m with V subscript o > 0 m/s. The particle experiences the variable force F subscript x = F subscript o sin (cx) as it moves to the right along the x-axis, where F subscript o and …

More Similar Questions