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Solve x^2-7ix-12=0...

Solve `x^2-7ix-12=0`

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`x^2-7ix-12=0`
rArrx^2-3ix-4ix-12=0`
`rArrx(x-3i)-4i(x-3i)=0`
`rArr(x-3i)(x-4i)=0`
`rArrx=3i,4i`
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