Algebra Examples

$\frac{1}{2} x^{2} - \frac{1}{2} = \frac{3}{8} x$

Step 1

Move all terms to the left side of the equation and simplify.

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Step 1.1

Simplify the left side.

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Step 1.1.1

Combine $\frac{1}{2}$ and $x^{2}$ .

$\frac{x^{2}}{2} - \frac{1}{2} = \frac{3}{8} x$

Step 1.2

Simplify the right side.

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Step 1.2.1

Combine $\frac{3}{8}$ and $x$ .

$\frac{x^{2}}{2} - \frac{1}{2} = \frac{3 x}{8}$

Step 1.3

Subtract $\frac{3 x}{8}$ from both sides of the equation.

$\frac{x^{2}}{2} - \frac{1}{2} - \frac{3 x}{8} = 0$

Step 2

Multiply through by the least common denominator $8$ , then simplify.

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Step 2.1

Apply the distributive property.

$8 (\frac{x^{2}}{2}) + 8 (- \frac{1}{2}) + 8 (- \frac{3 x}{8}) = 0$

Step 2.2

Simplify.

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Step 2.2.1

Cancel the common factor of $2$ .

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Step 2.2.1.1

Factor $2$ out of $8$ .

$2 (4) (\frac{x^{2}}{2}) + 8 (- \frac{1}{2}) + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.1.2

Cancel the common factor.

$2 \cdot (4 (\frac{x^{2}}{2})) + 8 (- \frac{1}{2}) + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.1.3

Rewrite the expression.

$4 x^{2} + 8 (- \frac{1}{2}) + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.2

Cancel the common factor of $2$ .

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Step 2.2.2.1

Move the leading negative in $- \frac{1}{2}$ into the numerator.

$4 x^{2} + 8 (\frac{- 1}{2}) + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.2.2

Factor $2$ out of $8$ .

$4 x^{2} + 2 (4) (\frac{- 1}{2}) + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.2.3

Cancel the common factor.

$4 x^{2} + 2 \cdot (4 (\frac{- 1}{2})) + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.2.4

Rewrite the expression.

$4 x^{2} + 4 \cdot - 1 + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.3

Multiply $4$ by $- 1$ .

$4 x^{2} - 4 + 8 (- \frac{3 x}{8}) = 0$

Step 2.2.4

Cancel the common factor of $8$ .

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Step 2.2.4.1

Move the leading negative in $- \frac{3 x}{8}$ into the numerator.

$4 x^{2} - 4 + 8 (\frac{- 3 x}{8}) = 0$

Step 2.2.4.2

Cancel the common factor.

$4 x^{2} - 4 + 8 (\frac{- 3 x}{8}) = 0$

Step 2.2.4.3

Rewrite the expression.

$4 x^{2} - 4 - 3 x = 0$

Step 2.3

Move $- 4$ .

$4 x^{2} - 3 x - 4 = 0$

Step 3

Use the quadratic formula to find the solutions.

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

Step 4

Substitute the values $a = 4$ , $b = - 3$ , and $c = - 4$ into the quadratic formula and solve for $x$ .

$\frac{3 \pm \sqrt{{(- 3)}^{2} - 4 \cdot (4 \cdot - 4)}}{2 \cdot 4}$

Step 5

Simplify.

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Step 5.1

Simplify the numerator.

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Step 5.1.1

Raise $- 3$ to the power of $2$ .

$x = \frac{3 \pm \sqrt{9 - 4 \cdot 4 \cdot - 4}}{2 \cdot 4}$

Step 5.1.2

Multiply $- 4 \cdot 4 \cdot - 4$ .

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Step 5.1.2.1

Multiply $- 4$ by $4$ .

$x = \frac{3 \pm \sqrt{9 - 16 \cdot - 4}}{2 \cdot 4}$

Step 5.1.2.2

Multiply $- 16$ by $- 4$ .

$x = \frac{3 \pm \sqrt{9 + 64}}{2 \cdot 4}$

Step 5.1.3

Add $9$ and $64$ .

$x = \frac{3 \pm \sqrt{73}}{2 \cdot 4}$

Step 5.2

Multiply $2$ by $4$ .

$x = \frac{3 \pm \sqrt{73}}{8}$

Step 6

The result can be shown in multiple forms.

Exact Form:

$x = \frac{3 \pm \sqrt{73}}{8}$

Decimal Form:

$x = 1.44300046 \dots, - 0.69300046 \dots$