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Mathematics 21 Online
OpenStudy (anonymous):

Simplify: (2-3i)(2+3i) || a) -5 b) 4-9i c) 13 d) 13-12i

OpenStudy (ajprincess):

|dw:1366297586274:dw||dw:1366297690075:dw| Does that help? @bethxo

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