Solve 3w^2=-18w

$$3 w ^ { 2 } = - 18 w$$

Solve for w

$$w=-6$$

$$w=0$$

Steps Using Factoring

Add 18w to both sides.

$$3w^{2}+18w=0$$

Factor out w.

$$w\left(3w+18\right)=0$$

To find equation solutions, solve w=0 and 3w+18=0.

$$w=0 w=-6$$

Steps Using the Quadratic Formula

Add 18w to both sides.

$$3w^{2}+18w=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 3 for a, 18 for b, and 0 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$w=\frac{-18±\sqrt{18^{2}}}{2\times 3}$$

Take the square root of 18^{2}.

$$w=\frac{-18±18}{2\times 3}$$

Multiply 2 times 3.

$$w=\frac{-18±18}{6}$$

Now solve the equation w=\frac{-18±18}{6} when ± is plus. Add -18 to 18.

$$w=\frac{0}{6}$$

Divide 0 by 6.

$$w=0$$

Now solve the equation w=\frac{-18±18}{6} when ± is minus. Subtract 18 from -18.

$$w=-\frac{36}{6}$$

Divide -36 by 6.

$$w=-6$$

The equation is now solved.

$$w=0 w=-6$$

Steps for Completing the Square

Add 18w to both sides.

$$3w^{2}+18w=0$$

Divide both sides by 3.

$$\frac{3w^{2}+18w}{3}=\frac{0}{3}$$

Dividing by 3 undoes the multiplication by 3.

$$w^{2}+\frac{18}{3}w=\frac{0}{3}$$

Divide 18 by 3.

$$w^{2}+6w=\frac{0}{3}$$

Divide 0 by 3.

$$w^{2}+6w=0$$

Divide 6, the coefficient of the x term, by 2 to get 3. Then add the square of 3 to both sides of the equation. This step makes the left hand side of the equation a perfect square.

$$w^{2}+6w+3^{2}=3^{2}$$

Square 3.

$$w^{2}+6w+9=9$$

Factor w^{2}+6w+9. In general, when x^{2}+bx+c is a perfect square, it can always be factored as \left(x+\frac{b}{2}\right)^{2}.

$$\left(w+3\right)^{2}=9$$

Take the square root of both sides of the equation.

$$\sqrt{\left(w+3\right)^{2}}=\sqrt{9}$$

Simplify.

$$w+3=3 w+3=-3$$

Subtract 3 from both sides of the equation.

$$w=0 w=-6$$