For what value of "a" will the product show below have a purely imaginary value?(with work please) (4+5i)(a+2i)

asked Aug 13, 2018 15.9k views

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

Meril answered Aug 20, 2018

by Meril

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