Algebra Examples

$x^{2} + 10 x = 26$

Step 1

To create a trinomial square on the left side of the equation, find a value that is equal to the square of half of $b$ .

${(\frac{b}{2})}^{2} = {(5)}^{2}$

Step 2

Add the term to each side of the equation.

$x^{2} + 10 x + {(5)}^{2} = 26 + {(5)}^{2}$

Step 3

Simplify the equation.

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Step 3.1

Simplify the left side.

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Step 3.1.1

Raise $5$ to the power of $2$ .

$x^{2} + 10 x + 25 = 26 + {(5)}^{2}$

Step 3.2

Simplify the right side.

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Step 3.2.1

Simplify $26 + {(5)}^{2}$ .

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Step 3.2.1.1

Raise $5$ to the power of $2$ .

$x^{2} + 10 x + 25 = 26 + 25$

Step 3.2.1.2

Add $26$ and $25$ .

$x^{2} + 10 x + 25 = 51$

Step 4

Factor the perfect trinomial square into ${(x + 5)}^{2}$ .

${(x + 5)}^{2} = 51$

Step 5

Solve the equation for $x$ .

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Step 5.1

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

$x + 5 = \pm \sqrt{51}$

Step 5.2

Subtract $5$ from both sides of the equation.

$x = \pm \sqrt{51} - 5$

Step 6

The result can be shown in multiple forms.

Exact Form:

$x = \pm \sqrt{51} - 5$

Decimal Form:

$x = 2.14142842 \dots, - 12.14142842 \dots$