Question

20^x=16

Answer 1

take logs of both sides
x log 20
x = log16 / log 20

Answer 2

= 0.9255

Answer 3

how do you know you have to take the logs do you just suppose to know

Answer 4

when the unknown quantity (here its x) is in the exponent as a general rule, take logs

Answer 5

its not necessary for simple problems like 2^x = 4
2^2 = 4 so x = 2
but for anything a bit more complicated taking logs is the way to go

Answer 6

ok?

Answer 7

oh ok that makes sense thanks

Answer 8

in my first post second line should be
x log 20 = log 16
sorry

Answer 9

plz click on good answer to close the question