轴 y=-(0.009(x-220)^2-220)

解答

轴

y = - (0.009 (x - 220)^{2} - 220)

x = 220

求解步骤

y = - (0.009 (x - 220)^{2} - 220)

将

y = - (0.009 (x - 220)^{2} - 220)

改写为标准形式

4 (- 27.77777 \dots) (y - 220) = (x - 220)^{2}

因此抛物线性质是:

(h, k) = (220, 220), p = - 27.77777 \dots

EN : P a r ab o l e S y mm e t ry A x i s T i tl e 2 Eq

x = 220

a x i s (x - 4)^{2} = 8 (y - 3)

a x i s y = - 2 x^{2} + 6 x + 10

a x i s y = - 3 (x + 6)^{2} + 4

a x i s y \leq 2 x^{2} - 10 x + 10

a x i s y = (x + \frac{1}{2}) (x - \frac{1}{3})