Write as a Function of x x^2-kx+21=0

$x^{2} - k x + 21 = 0$

Move all terms not containing $k$ to the right side of the equation.

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Subtract $x^{2}$ from both sides of the equation.

$- k x + 21 = - x^{2}$

Subtract $21$ from both sides of the equation.

$- k x = - x^{2} - 21$

Divide each term by $- 1 x$ and simplify.

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Divide each term in $- k x = - x^{2} - 21$ by $- 1 x$ .

$\frac{- k x}{- 1 x} = \frac{- x^{2}}{- 1 x} + \frac{- 21}{- 1 x}$

Simplify $\frac{- k x}{- 1 x}$ .

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Dividing two negative values results in a positive value.

$\frac{k x}{x} = \frac{- x^{2}}{- 1 x} + \frac{- 21}{- 1 x}$

Cancel the common factor of $x$ .

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Cancel the common factor.

$\frac{k x}{x} = \frac{- x^{2}}{- 1 x} + \frac{- 21}{- 1 x}$

Divide $k$ by $1$ .

$k = \frac{- x^{2}}{- 1 x} + \frac{- 21}{- 1 x}$

Simplify each term.

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Dividing two negative values results in a positive value.

$k = \frac{x^{2}}{x} + \frac{- 21}{- 1 x}$

Cancel the common factor of $x^{2}$ and $x$ .

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Factor $x$ out of $x^{2}$ .

$k = \frac{x \cdot x}{x} + \frac{- 21}{- 1 x}$

Cancel the common factors.

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Raise $x$ to the power of $1$ .

$k = \frac{x \cdot x}{x^{1}} + \frac{- 21}{- 1 x}$

Factor $x$ out of $x^{1}$ .

$k = \frac{x \cdot x}{x \cdot 1} + \frac{- 21}{- 1 x}$

Cancel the common factor.

$k = \frac{x \cdot x}{x \cdot 1} + \frac{- 21}{- 1 x}$

Rewrite the expression.

$k = \frac{x}{1} + \frac{- 21}{- 1 x}$

Divide $x$ by $1$ .

$k = x + \frac{- 21}{- 1 x}$

Dividing two negative values results in a positive value.

$k = x + \frac{21}{x}$

To rewrite as a function of $x$ , write the equation so that $k$ is by itself on one side of the equal sign and an expression involving only $x$ is on the other side.

$f (x) = x + \frac{21}{x}$

Write as a Function of x x^2-kx+21=0

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