Trigonometry Examples

$x^{2} + 7 x - 6 = 0$

Step 1

Use the quadratic formula to find the solutions.

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

Step 2

Substitute the values $a = 1$ , $b = 7$ , and $c = - 6$ into the quadratic formula and solve for $x$ .

$\frac{- 7 \pm \sqrt{7^{2} - 4 \cdot (1 \cdot - 6)}}{2 \cdot 1}$

Step 3

Simplify.

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Step 3.1

Simplify the numerator.

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Step 3.1.1

Raise $7$ to the power of $2$ .

$x = \frac{- 7 \pm \sqrt{49 - 4 \cdot 1 \cdot - 6}}{2 \cdot 1}$

Step 3.1.2

Multiply $- 4 \cdot 1 \cdot - 6$ .

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Step 3.1.2.1

Multiply $- 4$ by $1$ .

$x = \frac{- 7 \pm \sqrt{49 - 4 \cdot - 6}}{2 \cdot 1}$

Step 3.1.2.2

Multiply $- 4$ by $- 6$ .

$x = \frac{- 7 \pm \sqrt{49 + 24}}{2 \cdot 1}$

Step 3.1.3

Add $49$ and $24$ .

$x = \frac{- 7 \pm \sqrt{73}}{2 \cdot 1}$

Step 3.2

Multiply $2$ by $1$ .

$x = \frac{- 7 \pm \sqrt{73}}{2}$

Step 4

The final answer is the combination of both solutions.

$x = - \frac{7 - \sqrt{73}}{2}, - \frac{7 + \sqrt{73}}{2}$

Step 5

The result can be shown in multiple forms.

Exact Form:

$x = - \frac{7 - \sqrt{73}}{2}, - \frac{7 + \sqrt{73}}{2}$

Decimal Form:

$x = 0.77200187 \dots, - 7.77200187 \dots$