Thread: is there a way to solve this?

81s^2 - 1 = 0

Hello,

Originally Posted by mathdummy22

81s^2 - 1 = 0

Note that

so it can be written

formula for the difference of two squares... ?

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

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