Question

Solve 5^-x = 625

Answer 1

does it help to know that \(5^4=625\) ?

Answer 2

u can basicallt take the 4th root of 625 so your answer would be 5

Answer 3

The only issue is that the value of x equals a negative. Simply making 4 a negative does not solve the equation. :/

Answer 4

so if the x is negative u move it to the denominator to make the exponent into a positive numnber

Answer 5

So, to solve any problem like this:

     5ˣ = 625 ... take the log of both sides
    log[5ˣ] = log[625]
      x • log[5] = log[625]
     x = log[625] ⁄ log[5]
     x = 4

Answer 6

wtf ozzman don't answer if you don't know

Answer 7

did that help?

Answer 8

oops i read that as log 5^-x=625 from the start

Answer 9

@plohr the x value is negative not positive.