Respuesta :

ghaithgh

Answer:

[tex] {( - 7 + 2i)}^{2} = ( - 7 + 2i)( - 7 + 2i) \\ = 49 - 14i - 14i + 4 {i}^{2} \\ = 49 - 28i - 4 \\ = 45 - 28i[/tex]

Yang100

Answer:

45-28i

Step-by-step explanation:

(-7+2i)^2

(-7+2i)(-7+2i)

49-14i-14i+4i^2 where i^2=-1

49-28i+4(-1)

49-28i-4

49-4-28i

45-28i

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