Question

ma ajuta cineva. Am nevoie urgent ​

Answer 1

Răspuns:

a)

${z}^{4} - 8 {z}^{2} = - 25 \\ {z}^{2} - 8 = - 25$

${z}^{2} = - 25 + 8 \\ {z}^{2} = - 17 \\ z = - \sqrt{17}$

b)

${z}^{2} = 2 - \frac{9}{ {z}^{2} }$

c)