Solve for k 25x^2+kx+4=0

$25 x^{2} + k x + 4 = 0$

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

Subtract $25 x^{2}$ from both sides of the equation.

$k x + 4 = - 25 x^{2}$

Subtract $4$ from both sides of the equation.

$k x = - 25 x^{2} - 4$

Divide each term in $k x = - 25 x^{2} - 4$ by $x$ and simplify.

Divide each term in $k x = - 25 x^{2} - 4$ by $x$ .

$\frac{k x}{x} = \frac{- 25 x^{2}}{x} + \frac{- 4}{x}$

Simplify the left side.

Cancel the common factor of $x$ .

Cancel the common factor.

$\frac{k x}{x} = \frac{- 25 x^{2}}{x} + \frac{- 4}{x}$

Divide $k$ by $1$ .

$k = \frac{- 25 x^{2}}{x} + \frac{- 4}{x}$

Simplify the right side.

Simplify each term.

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

Factor $x$ out of $- 25 x^{2}$ .

$k = \frac{x (- 25 x)}{x} + \frac{- 4}{x}$

Cancel the common factors.

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

$k = \frac{x (- 25 x)}{x^{1}} + \frac{- 4}{x}$

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

$k = \frac{x (- 25 x)}{x \cdot 1} + \frac{- 4}{x}$

Cancel the common factor.

$k = \frac{x (- 25 x)}{x \cdot 1} + \frac{- 4}{x}$

Rewrite the expression.

$k = \frac{- 25 x}{1} + \frac{- 4}{x}$

Divide $- 25 x$ by $1$ .

$k = - 25 x + \frac{- 4}{x}$

Move the negative in front of the fraction.

$k = - 25 x - \frac{4}{x}$