\begin{array}{*{20}c} {x = \frac{{ - b \pm \sqrt {b^2 - 4ac} }}{{2a}}} & {{\rm{when}}} & {ax^2 + bx + c = 0} \\ \end{array}

% MathType!MTEF!2!1!+-
% feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9
% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x
% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqbaeqabeWaaa
% qaaiaadIhacqGH9aqpdaWcaaqaaiabgkHiTiaadkgacqGHXcqSdaGc
% aaqaaiaadkgadaahaaWcbeqaaiaaikdaaaGccqGHsislcaaI0aGaam
% yyaiaadogaaSqabaaakeaacaaIYaGaamyyaaaaaeaacaqG3bGaaeiA
% aiaabwgacaqGUbaabaGaamyyaiaadIhadaahaaWcbeqaaiaaikdaaa
% GccqGHRaWkcaWGIbGaamiEaiabgUcaRiaadogacqGH9aqpcaaIWaaa
% aaaa!4FCD!

Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.