求反函数 y=x^2+3x+2

解答

求反函数

y = x^{2} + 3 x + 2

\frac{- 3 + 4 x + 1}{2}, \frac{- 3 - 4 x + 1}{2}

求解步骤

y = x^{2} + 3 x + 2

用

y

替代

x

x = y^{2} + 3 y + 2

求解

y, x = y^{2} + 3 y + 2

\frac{- 3 + 4 x + 1}{2}, \frac{- 3 - 4 x + 1}{2}

d o main lo g_{a} (x^{2} - 4)

e x t re m e f (x) = 5 x^{2} ln (\frac{x}{2})

e x t re m e f (x) = \frac{x}{49 + x ^{2}}

p a r i t y f (x) = 3 x + 1

d o main f (x) = 25 - x^{2} + x + 3