Algebra Examples

$x^{2} + 4 x = 23$

Step 1

Subtract $23$ from both sides of the equation.

$x^{2} + 4 x - 23 = 0$

Step 2

Use the form $a x^{2} + b x + c$ , to find the values of $a$ , $b$ , and $c$ .

$a = 1$

$b = 4$

$c = - 23 = 0$

Step 3

Consider the vertex form of a parabola.

$a {(x + d)}^{2} + e = 0$

Step 4

Find the value of $d$ using the formula $d = \frac{b}{2 a}$ .

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Step 4.1

Substitute the values of $a$ and $b$ into the formula $d = \frac{b}{2 a}$ .

$d = \frac{4}{2 \cdot 1}$

Step 4.2

Cancel the common factor of $4$ and $2$ .

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Step 4.2.1

Factor $2$ out of $4$ .

$d = \frac{2 \cdot 2}{2 \cdot 1}$

Step 4.2.2

Cancel the common factors.

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Step 4.2.2.1

Factor $2$ out of $2 \cdot 1$ .

$d = \frac{2 \cdot 2}{2 (1)}$

Step 4.2.2.2

Cancel the common factor.

$d = \frac{2 \cdot 2}{2 \cdot 1}$

Step 4.2.2.3

Rewrite the expression.

$d = \frac{2}{1}$

Step 4.2.2.4

Divide $2$ by $1$ .

$d = 2$

Step 5

Find the value of $e$ using the formula $e = c - \frac{b^{2}}{4 a}$ .

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Step 5.1

Substitute the values of $c$ , $b$ and $a$ into the formula $e = c - \frac{b^{2}}{4 a}$ .

$e = - 23 - \frac{4^{2}}{4 \cdot 1}$

Step 5.2

Simplify the right side.

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Step 5.2.1

Simplify each term.

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Step 5.2.1.1

Cancel the common factor of $4^{2}$ and $4$ .

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Step 5.2.1.1.1

Factor $4$ out of $4^{2}$ .

$e = - 23 - \frac{4 \cdot 4}{4 \cdot 1}$

Step 5.2.1.1.2

Cancel the common factors.

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Step 5.2.1.1.2.1

Factor $4$ out of $4 \cdot 1$ .

$e = - 23 - \frac{4 \cdot 4}{4 (1)}$

Step 5.2.1.1.2.2

Cancel the common factor.

$e = - 23 - \frac{4 \cdot 4}{4 \cdot 1}$

Step 5.2.1.1.2.3

Rewrite the expression.

$e = - 23 - \frac{4}{1}$

Step 5.2.1.1.2.4

Divide $4$ by $1$ .

$e = - 23 - 1 \cdot 4$

Step 5.2.1.2

Multiply $- 1$ by $4$ .

$e = - 23 - 4$

Step 5.2.2

Subtract $4$ from $- 23$ .

$e = - 27$

Step 6

Substitute the values of $a$ , $d$ , and $e$ into the vertex form ${(x + 2)}^{2} - 27$ .

${(x + 2)}^{2} - 27 = 0$