Question

помогите пожалуйста!!

Answer 1

Ответ:

a)

${x}^{2} - 0.64 = 0$

${x}^{2} = 0.64$

x=±0.8

б)

$81 - 49 {y}^{2} = 0$

$49 {y}^{2} = 81$

${y}^{2} = \frac{81}{49}$

$y = + - \frac{9}{7}$