Expanding in mathematics typically refers to simplifying an expression to its simplest form. For example, this expression:
(2x+1)(x+5)
could be expanded by multiplying the two quantities together using FOIL (First-Outer-Inner-Last):
(2x*x) + (2x*5) + (1*x) + (1*5)
^first ^outer ^inner ^last
and then simplifying to come up with a final, expanded answer:
2x2 + 11x + 5
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