y^2=8

解答

y^{2} = 8

y = 22, y = - 22

十进制

y = 2.82842 \dots, y = - 2.82842 \dots

求解步骤

y^{2} = 8

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

y = 8, y = - 8

8 = 22

- 8 = - 22

y = 22, y = - 22

2 m x^{2} - (m - 4) x - 2 = 0

so l v e f or x, 5 x^{2} + 4 x y + 8 y^{2} - 40 x - 52 y + 116 = 0

m^{2} + 6 m - 16 = - 4

so l v e f or x, 4 x^{2} + 9 y^{2} - 16 x + 18 y + 25 = 0

5 x^{2} - 50 x = - 135