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A +5.50 nC point charge and a -3.00 nC point charge are 2.5 cm apart. the...

A +5.50 nC point charge and a -3.00 nC point charge are 2.5 cm apart. the electric field strength at the midpoint between the charges is ____ N/C.

the answer key lists the answer as 5.47x10^5. can someone please explain how they got this answer. please do not answer if you do not get 5.47x10^5 so i know where i went wrong.
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