Homework Help: math

Posted by Anonymous on Saturday, July 14, 2007 at 11:42am.

solve for x without using a calculator
5^(x+1) = 25

i know that x would equal 1 because 5^2 is 25, but i don't know how to show how to solve it

All you need to do is what you just did: Explain that if x = 1, the equation is satisfied.

If you are looking for a method of solution other than a guess that happens to work, take the log of both sides of the equation.
(x+1) log 5 = log 25
x+1 = log 25/log 5 = (log 5^2)/log5
= (2 log 5)/log 5 = 2
x = 1

solve for x without using a calculator
5^(x+1) = 25

5^(x + 1) = 25 = 5^2

Therefore, (x + 1) = 2 making x = 1.

math - Anonymous, Monday, October 8, 2007 at 5:27pm
(x+1)(x-1)=5(x-1)

Answer this Question

Related Questions

maths - how do i work out 7.25/0.25 without using a calculator???
Adv. Alg/Trig - How would you solve tan(-335) without using a calculator? I got ...
math - Solve for x (without using a calculator): log base 3 of x^2= 2log base 3 ...
Algebra - How would i solve for this problems? also what is the answer(s) 5.)...
math - explain how you can find the sum 25+59 without using pencil and paper or ...
math please - what exactly is a prime factor would x-5 x+5 and x2+25 all be ...
Math - Hi,I need to know how to do question like this without using a calculator...
math - (x-4)/(2x+4) is greater than or equal to 1. How do i express solutions to...
math - which expression below shows how much paul would collect in a week if he ...
math - using the inverse property of division how would you isolate -4.2? ...

For Further Reading

First Name:
School Subject:
Answer: