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Mathematics, 27.08.2021 22:00 ineedhelp2285

Write (2 – i)4 in simplest a + bi form.

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ansver
Answer from: 11needhelp11

Answer : 21 - 20i

Step-by-step explanation:

{(2 - i)}^{4}  = (2 - i) {}^{2} (2 - i) {}^{2}  \\  \\  = (4 - 2i -  {i}^{2} )(4 - 2i -  {i}^{2} )

remember i² is -1 :

= (4 - 2i - ( - 1))(4 - 2i - ( - 1)) \\  = (5 - 2i)(5 - 2i) \\  \\  = (25 - 20i + 4 {i}^{2} ) \\  = (25 - 20i + 4( - 1)) \\  = (25 - 20i - 4) \\  = 21 - 20i

ansver
Answer from: Quest
Ithink it's the first one ( let me know if it right)
Graph the line y = -3x -2 (see attachment)
ansver
Answer from: Quest

answer: c. is your answer

step-by-step explanation: get me a black leather coat

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Write (2 – i)4 in simplest a + bi form....

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