# Math Help - is there a way to solve this?

1. ## is there a way to solve this?

81s^2 - 1 = 0

2. Hello,
Originally Posted by mathdummy22
81s^2 - 1 = 0
Note that $81=9^2$

so it can be written $(9s)^2-1^2=0$

formula for the difference of two squares... ?

3. you have 81s^2=1, or s^2=1/81. Now take square roots to find s=sqrt(1/81) or s=-sqrt(1/81). So s=1/9 or s=-1/9

4. Originally Posted by mathdummy22
81s^2 - 1 = 0
I would do the following

81 s^2 - 1- = 0

81s^2 = 1 add 1 to both sides

s^2 = 1/81 divide both sides by 81

s = 1/9 take square root of both sides.

Hope that helps. First time to this site.
Marion