dankness216 dankness216
  • 21-09-2018
  • Mathematics
contestada

Which expression is equal to −2i(4−i)?


A. −2−8i

B. 8−2i

C. 2−8i

D. −8−2i

Respuesta :

qterya15
qterya15 qterya15
  • 21-09-2018

The answer is A -2-8i


Answer Link
erinna erinna
  • 23-09-2019

Answer:

The correct option is A.

Step-by-step explanation:

The given expression is

[tex]-2i(4-i)[/tex]

We need to find the simplified form of the given expression.

Using distributive property we get

[tex]-2i(4)-2i(-i)[/tex]

[tex]-8i+2i^2[/tex]

We know that [tex]i^2=-1[/tex]. Using this fact we get

[tex]-8i+2(-1)[/tex]

[tex]-8i-2[/tex]

Write the above expression as a+ib.

[tex]-2-8i[/tex]

Therefore the correct option is A.

Answer Link

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