Solve by Factoring x^4+7x^3+10x^2=0

$x^{4} + 7 x^{3} + 10 x^{2} = 0$

Step 1

Factor $x^{2}$ out of $x^{4} + 7 x^{3} + 10 x^{2}$ .

Factor $x^{2}$ out of $x^{4}$ .

$x^{2} x^{2} + 7 x^{3} + 10 x^{2} = 0$

Factor $x^{2}$ out of $7 x^{3}$ .

$x^{2} x^{2} + x^{2} (7 x) + 10 x^{2} = 0$

Factor $x^{2}$ out of $10 x^{2}$ .

$x^{2} x^{2} + x^{2} (7 x) + x^{2} \cdot 10 = 0$

Factor $x^{2}$ out of $x^{2} x^{2} + x^{2} (7 x)$ .

$x^{2} (x^{2} + 7 x) + x^{2} \cdot 10 = 0$

Factor $x^{2}$ out of $x^{2} (x^{2} + 7 x) + x^{2} \cdot 10$ .

$x^{2} (x^{2} + 7 x + 10) = 0$

Step 2

Factor.

Factor $x^{2} + 7 x + 10$ 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 $10$ and whose sum is $7$ .

$2, 5$

Write the factored form using these integers.

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

Remove unnecessary parentheses.

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

Step 3

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

$x^{2} = 0$

$x + 2 = 0$

$x + 5 = 0$

Step 4

Set $x^{2}$ equal to $0$ and solve for $x$ .

Set $x^{2}$ equal to $0$ .

$x^{2} = 0$

Solve $x^{2} = 0$ for $x$ .

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt{0}$

Simplify $\pm \sqrt{0}$ .

Rewrite $0$ as $0^{2}$ .

$x = \pm \sqrt{0^{2}}$

Pull terms out from under the radical, assuming positive real numbers.

$x = \pm 0$

Plus or minus $0$ is $0$ .

$x = 0$

Step 5

Set $x + 2$ equal to $0$ and solve for $x$ .

Set $x + 2$ equal to $0$ .

$x + 2 = 0$

Subtract $2$ from both sides of the equation.

$x = - 2$

Step 6

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.

$x = - 5$

Step 7

The final solution is all the values that make $x^{2} (x + 2) (x + 5) = 0$ true.

$x = 0, - 2, - 5$

Solve by Factoring x^4+7x^3+10x^2=0

Related Questions

Support LCMGCF.com by disabling your adblocker.