Algebra Examples

$x^{2} - \frac{2}{5} x$

Simplify each term.

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Combine $x$ and $\frac{2}{5}$ .

$x^{2} - \frac{x \cdot 2}{5}$

Move $2$ to the left of $x$ .

$x^{2} - \frac{2 x}{5}$

To find the $c$ value $c = {(\frac{b}{2})}^{2}$ , divide the coefficient of $x$ by $2$ and square the result.

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Multiply the numerator by the reciprocal of the denominator.

${(- \frac{2}{5} \cdot \frac{1}{2})}^{2}$

Cancel the common factor of $2$ .

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Move the leading negative in $- \frac{2}{5}$ into the numerator.

${(\frac{- 2}{5} \cdot \frac{1}{2})}^{2}$

Factor $2$ out of $- 2$ .

${(\frac{2 (- 1)}{5} \cdot \frac{1}{2})}^{2}$

Cancel the common factor.

${(\frac{2 \cdot - 1}{5} \cdot \frac{1}{2})}^{2}$

Rewrite the expression.

${(\frac{- 1}{5})}^{2}$

Move the negative in front of the fraction.

${(- \frac{1}{5})}^{2}$

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Apply the product rule to $- \frac{1}{5}$ .

${(- 1)}^{2} {(\frac{1}{5})}^{2}$

Apply the product rule to $\frac{1}{5}$ .

${(- 1)}^{2} \frac{1^{2}}{5^{2}}$

Raise $- 1$ to the power of $2$ .

$1 \frac{1^{2}}{5^{2}}$

Multiply $\frac{1^{2}}{5^{2}}$ by $1$ .

$\frac{1^{2}}{5^{2}}$

One to any power is one.

$\frac{1}{5^{2}}$

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

$\frac{1}{25}$

Add $\frac{1}{25}$ to get the perfect square trinomial.

$x^{2} - \frac{2}{5} x + \frac{1}{25}$