What is the inverse of 21x^2+5x-84 ?

The inverse of 21x^2+5x-84 is (-5+sqrt(84x+7081))/(42),(-5-sqrt(84x+7081))/(42)

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inverse of 21x^2+5x-84

inverse

21 x^{2} + 5 x - 84

\frac{- 5 + 84 x + 7081}{42}, \frac{- 5 - 84 x + 7081}{42}

Solution steps

y = 21 x^{2} + 5 x - 84

Replace

x

with

y

x = 21 y^{2} + 5 y - 84

Solve for

y, x = 21 y^{2} + 5 y - 84

\frac{- 5 + 84 x + 7081}{42}, \frac{- 5 - 84 x + 7081}{42}

f (x) = \frac{x}{2} + \frac{x - 2 ( x + 2 )}{4}

f (x) = (x + 1)^{0.5}

f (x) = f (x) = - 4 x - 1

f (x) = - 2 x + 11

f (x) = - 2 x + 12

What is the inverse of 21x^2+5x-84 ?
The inverse of 21x^2+5x-84 is (-5+sqrt(84x+7081))/(42),(-5-sqrt(84x+7081))/(42)