24-02-2017
Mathematics

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For what value of "a" will the product show below have a purely imaginary value?(with work please)

(4+5i)(a+2i)

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Danielle129 Danielle129

24-02-2017

4 + 5 • i Or 1 = 9
a or 1 + 2 • i or 1 = 3
9 + 3 = 12
12 is the answer

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