יהודה
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How could I rewrite $\dfrac{6 + 4 {i}} { -9 - 4 {i}}$ in a+bi form?
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By multiplying both the numerator and denominator by the conjugate partner of "-9 - 4i" which is "-9 + 4i", you will get: $\dfrac{-54 + 24 {i} - 36{i} +16i^2} { 81 - 36 {i} + 36 {i}...

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