222daydreaminh 222daydreaminh

11-05-2022
Mathematics

contestada

simplify:
(3i)(5i)(6+5i)

Respuesta :

reinhard10158 reinhard10158

14-05-2022

Step-by-step explanation:

remember, i = sqrt(-1)

let's go left to right :

(3i)(5i) = 3×sqrt(-1)×5×sqrt(-1) = 3×5×sqrt²(-1) = 15×-1 = -15

-15×(6+5i) = -90 - 75i

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