Question 254393
Our equation was
(i) {{{7/(-3sqrt(2)+1)}}}
step 1 - find the conjugate as
-3sqrt(2) - 1 and then multiply by top and bottom to get
(ii) {{{7*(-3sqrt(2)-1)}}} / {{{(-3sqrt(2) + 1)*(-3sqrt(2) - 1)}}}
which is simplified to 
(iii) {{{7*(-3sqrt(2)-1)}}} / {{{17}}}