Solve the Inequality for x 5-4x-x^2>0

$5 - 4 x - x^{2} > 0$

Convert the inequality to an equation.

$5 - 4 x - x^{2} = 0$

Factor the left side of the equation.

Factor $- 1$ out of $5 - 4 x - x^{2}$ .

Reorder the expression.

Move $5$ .

$- 4 x - x^{2} + 5 = 0$

Reorder $- 4 x$ and $- x^{2}$ .

$- x^{2} - 4 x + 5 = 0$

Factor $- 1$ out of $- x^{2}$ .

$- (x^{2}) - 4 x + 5 = 0$

Factor $- 1$ out of $- 4 x$ .

$- (x^{2}) - (4 x) + 5 = 0$

Rewrite $5$ as $- 1 (- 5)$ .

$- (x^{2}) - (4 x) - 1 \cdot - 5 = 0$

Factor $- 1$ out of $- (x^{2}) - (4 x)$ .

$- (x^{2} + 4 x) - 1 \cdot - 5 = 0$

Factor $- 1$ out of $- (x^{2} + 4 x) - 1 (- 5)$ .

$- (x^{2} + 4 x - 5) = 0$

Factor.

Factor $x^{2} + 4 x - 5$ using the AC method.

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 5$ and whose sum is $4$ .

$- 1, 5$

Write the factored form using these integers.

$- ((x - 1) (x + 5)) = 0$

Remove unnecessary parentheses.

$- (x - 1) (x + 5) = 0$

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x - 1 = 0$

$x + 5 = 0$

Set $x - 1$ equal to $0$ and solve for $x$ .

Set $x - 1$ equal to $0$ .

$x - 1 = 0$

Add $1$ to both sides of the equation.

$x = 1$

Set $x + 5$ equal to $0$ and solve for $x$ .

Set $x + 5$ equal to $0$ .

$x + 5 = 0$

Subtract $5$ from both sides of the equation.

$x = - 5$

The final solution is all the values that make $- (x - 1) (x + 5) = 0$ true.

$x = 1, - 5$

Use each root to create test intervals.

$x < - 5$

$- 5 < x < 1$

$x > 1$

Choose a test value from each interval and plug this value into the original inequality to determine which intervals satisfy the inequality.

Test a value on the interval $x < - 5$ to see if it makes the inequality true.

Choose a value on the interval $x < - 5$ and see if this value makes the original inequality true.

$x = - 8$

Replace $x$ with $- 8$ in the original inequality.

$5 - 4 \cdot - 8 - {(- 8)}^{2} > 0$

The left side $- 27$ is not greater than the right side $0$ , which means that the given statement is false.

False

Test a value on the interval $- 5 < x < 1$ to see if it makes the inequality true.

Choose a value on the interval $- 5 < x < 1$ and see if this value makes the original inequality true.

$x = 0$

Replace $x$ with $0$ in the original inequality.

$5 - 4 \cdot 0 - {(0)}^{2} > 0$

The left side $5$ is greater than the right side $0$ , which means that the given statement is always true.

True

Test a value on the interval $x > 1$ to see if it makes the inequality true.

Choose a value on the interval $x > 1$ and see if this value makes the original inequality true.

$x = 4$

Replace $x$ with $4$ in the original inequality.

$5 - 4 \cdot 4 - {(4)}^{2} > 0$

The left side $- 27$ is not greater than the right side $0$ , which means that the given statement is false.

False

Compare the intervals to determine which ones satisfy the original inequality.

$x < - 5$ False

$- 5 < x < 1$ True

$x > 1$ False

$x < - 5$ False

$- 5 < x < 1$ True

$x > 1$ False

The solution consists of all of the true intervals.

$- 5 < x < 1$

The result can be shown in multiple forms.

Inequality Form:

$- 5 < x < 1$

Interval Notation:

$(- 5, 1)$

Solve the Inequality for x 5-4x-x^2>0

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