81s^2 - 1 = 0
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.