Algebra Examples

x^{2} + 7 x + 12 = 0

$x^{2} + 7 x + 12 = 0$

Step 1

Use the quadratic formula to find the solutions.

\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 2

Substitute the values

a = 1

$a = 1$ ,

b = 7

$b = 7$ , and

c = 12

$c = 12$ into the quadratic formula and solve for

x

$x$ .

\frac{- 7 \pm \sqrt{7^{2} - 4 \cdot (1 \cdot 12)}}{2 \cdot 1}

$\frac{- 7 \pm \sqrt{7^{2} - 4 \cdot (1 \cdot 12)}}{2 \cdot 1}$

Step 3

Simplify.

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Step 3.1

Simplify the numerator.

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Step 3.1.1

Raise

7

$7$ to the power of

2

$2$ .

x = \frac{- 7 \pm \sqrt{49 - 4 \cdot 1 \cdot 12}}{2 \cdot 1}

$x = \frac{- 7 \pm \sqrt{49 - 4 \cdot 1 \cdot 12}}{2 \cdot 1}$

Step 3.1.2

Multiply

- 4 \cdot 1 \cdot 12

$- 4 \cdot 1 \cdot 12$ .

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Step 3.1.2.1

Multiply

- 4

$- 4$ by

1

$1$ .

x = \frac{- 7 \pm \sqrt{49 - 4 \cdot 12}}{2 \cdot 1}

$x = \frac{- 7 \pm \sqrt{49 - 4 \cdot 12}}{2 \cdot 1}$

Step 3.1.2.2

Multiply

- 4

$- 4$ by

12

$12$ .

x = \frac{- 7 \pm \sqrt{49 - 48}}{2 \cdot 1}

$x = \frac{- 7 \pm \sqrt{49 - 48}}{2 \cdot 1}$

x = \frac{- 7 \pm \sqrt{49 - 48}}{2 \cdot 1}

$x = \frac{- 7 \pm \sqrt{49 - 48}}{2 \cdot 1}$

Step 3.1.3

Subtract

48

$48$ from

49

$49$ .

x = \frac{- 7 \pm \sqrt{1}}{2 \cdot 1}

$x = \frac{- 7 \pm \sqrt{1}}{2 \cdot 1}$

Step 3.1.4

Any root of

1

$1$ is

1

$1$ .

x = \frac{- 7 \pm 1}{2 \cdot 1}

$x = \frac{- 7 \pm 1}{2 \cdot 1}$

x = \frac{- 7 \pm 1}{2 \cdot 1}

$x = \frac{- 7 \pm 1}{2 \cdot 1}$

Step 3.2

Multiply

2

$2$ by

1

$1$ .

x = \frac{- 7 \pm 1}{2}

$x = \frac{- 7 \pm 1}{2}$

x = \frac{- 7 \pm 1}{2}

$x = \frac{- 7 \pm 1}{2}$

Step 4

The final answer is the combination of both solutions.

x = - 3, - 4

$x = - 3, - 4$