emilylarkin emilylarkin

02-10-2020
Mathematics

contestada

HELPPPP (COMLEX NUMBERS AND OPERATIONS

Write the expression 3i(2 - 5i)(4 + i) in the form a + bi.

Respuesta :

jimrgrant1 jimrgrant1

02-10-2020

Answer:

54 + 39i

Step-by-step explanation:

Given

3i(2 - 5i)(4 + i) ← expand factors using FOIL

= 3i(8 - 18i - 5i² ) → using i² = - 1

= 3i(13 - 18i) ← distribute parenthesis by 3i

= 39i - 54i²

= 54 + 39i

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