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(2+3i)(4-5i) |
| (2+3i)(4-5i) = 2( 4 - 5i) + 3(4 - 5i) = 8 - 10i + 12i - 15i2 = 8 + 2i - 15(-1) = 8 + 2i + 15 = 23 + 2i |
