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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)

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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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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User Lrathod
by
8.6k points

1 Answer

1 vote
4 + 5 • i Or 1 = 9
a or 1 + 2 • i or 1 = 3
9 + 3 = 12
12 is the answer
answered
User Meril
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8.4k points
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