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Sydnee
Mathematics
14 June, 17:40
Find the product of 5+i and 4-i
+5
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Lamar Bowers
14 June, 18:01
0
21 - i
Step-by-step explanation:
(5+i) * (4-i) = 5 * (4-i) + i * (4-i)
= 5*4 - 5*i + i*4 - i*i
= 20 - 5i + 4i - i²
= 20 - 5i + 4i - (-1) { i² = - 1 }
= 20 - 5i + 4i + 1
= 21 - i
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