Question

If 10-10ˣ=9.9, find x

Answer 1

we are given

`10-10^x=9.9`

we can move 10 on right side

`-10^x=9.9-10`

`-10^x=-0.1`

we cancel -1

`10^x=0.1`

we can rewrite right side

`10^x=10^(-1)`

we can compare exponents

and we get

`x=-1`.............Answer