Expand generally means to expand the problem. I'm assuming this is a function, you'd expand it into a simpler form (factor things out and such).
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Contract or shrink.
elaborate on your answers means 'expand' or 'tell us more' add more information...
get bigger or expand you can pick which one you want to try get bigger or expand
24000 = 20000 + 4000 in expand form
The noun form of expand is expansion. Expanding can also be used as a noun.