Precalculus Examples

$y^{2} - 4 y$

Step 1

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

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Step 1.1

Divide $4$ by $2$ .

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

Step 1.2

Multiply $- 1$ by $2$ .

${(- 2)}^{2}$

Step 1.3

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

$4$

Step 2

Add $4$ to get the perfect square trinomial.

$y^{2} - 4 y + 4$