Question

помогите номер 10, пожалуйста

Answer 1

${y}^{2} - {b}^{2} + 4b - 4 \ {y}^{2} = {b}^{2} - 4b + 4 \ {y}^{2} = {(b - 2)}^{2} \ y = b - 2$
${c}^{2} - frac{2c}{3} + frac{1}{9} - frac{1}{9} times {y}^{2} = 0 \ frac{1}{9} times {y}^{2} = {c}^{2} - frac{2c}{3} + frac{1}{9}$
Перемножим обе части на 9
${y}^{2} = 9 {c}^{2} - 6c + 1 \ y = sqrt{9 {c}^{2} - 6c + 1}$