What is the inverse of f(x)=x^2+3x-21 ?

The inverse of f(x)=x^2+3x-21 is (-3+sqrt(4x+93))/2 ,(-3-sqrt(4x+93))/2

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inverse of f(x)=x^2+3x-21

inverse

f (x) = x^{2} + 3 x - 21

\frac{- 3 + 4 x + 93}{2}, \frac{- 3 - 4 x + 93}{2}

Solution steps

y = x^{2} + 3 x - 21

Replace

x

with

y

x = y^{2} + 3 y - 21

Solve for

y, x = y^{2} + 3 y - 21

\frac{- 3 + 4 x + 93}{2}, \frac{- 3 - 4 x + 93}{2}

2 (x - a) (x + 2 a)

f (x) = \frac{2}{x - 5} - 3

f (x) = 16, y = \frac{3}{8}

f (x) = - x^{2} + 11 x - 30

lo g_{3} (x + 3)

What is the inverse of f(x)=x^2+3x-21 ?
The inverse of f(x)=x^2+3x-21 is (-3+sqrt(4x+93))/2 ,(-3-sqrt(4x+93))/2