Solve by Factoring x^3+3x^2-18x=0

$x^{3} + 3 x^{2} - 18 x = 0$

Step 1

Factor $x$ out of $x^{3} + 3 x^{2} - 18 x$ .

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

$x \cdot x^{2} + 3 x^{2} - 18 x = 0$

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

$x \cdot x^{2} + x (3 x) - 18 x = 0$

Factor $x$ out of $- 18 x$ .

$x \cdot x^{2} + x (3 x) + x \cdot - 18 = 0$

Factor $x$ out of $x \cdot x^{2} + x (3 x)$ .

$x (x^{2} + 3 x) + x \cdot - 18 = 0$

Factor $x$ out of $x (x^{2} + 3 x) + x \cdot - 18$ .

$x (x^{2} + 3 x - 18) = 0$

Step 2

Factor.

Factor $x^{2} + 3 x - 18$ 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 $- 18$ and whose sum is $3$ .

$- 3, 6$

Write the factored form using these integers.

$x ((x - 3) (x + 6)) = 0$

Remove unnecessary parentheses.

$x (x - 3) (x + 6) = 0$

Step 3

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

$x = 0$

$x - 3 = 0$

$x + 6 = 0$

Step 4

Set $x$ equal to $0$ .

$x = 0$

Step 5

Set $x - 3$ equal to $0$ and solve for $x$ .

Set $x - 3$ equal to $0$ .

$x - 3 = 0$

Add $3$ to both sides of the equation.

$x = 3$

Step 6

Set $x + 6$ equal to $0$ and solve for $x$ .

Set $x + 6$ equal to $0$ .

$x + 6 = 0$

Subtract $6$ from both sides of the equation.

$x = - 6$

Step 7

The final solution is all the values that make $x (x - 3) (x + 6) = 0$ true.

$x = 0, 3, - 6$

Solve by Factoring x^3+3x^2-18x=0

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