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How do I express the following in the form a+ib?

[tex] (\sqrt{-4} - 1) (\sqrt{-9}) [/tex]

My attempt:

(2i - 1)(3i)

6i-3i = 3i

[tex] (\sqrt{-4} - 1) (\sqrt{-9}) [/tex]

My attempt:

(2i - 1)(3i)

6i-3i = 3i

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