Find the Holes in the Graph (x^2+2x+1)/(2x+2)

$\frac{x^{2} + 2 x + 1}{2 x + 2}$

Step 1

Factor using the perfect square rule.

Rewrite $1$ as $1^{2}$ .

$\frac{x^{2} + 2 x + 1^{2}}{2 x + 2}$

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$2 x = 2 \cdot x \cdot 1$

Rewrite the polynomial.

$\frac{x^{2} + 2 \cdot x \cdot 1 + 1^{2}}{2 x + 2}$

Factor using the perfect square trinomial rule $a^{2} + 2 a b + b^{2} = {(a + b)}^{2}$ , where $a = x$ and $b = 1$ .

$\frac{{(x + 1)}^{2}}{2 x + 2}$

Step 2

Factor $2$ out of $2 x + 2$ .

Factor $2$ out of $2 x$ .

$\frac{{(x + 1)}^{2}}{2 (x) + 2}$

Factor $2$ out of $2$ .

$\frac{{(x + 1)}^{2}}{2 (x) + 2 (1)}$

Factor $2$ out of $2 (x) + 2 (1)$ .

$\frac{{(x + 1)}^{2}}{2 (x + 1)}$

Step 3

Cancel the common factor of ${(x + 1)}^{2}$ and $x + 1$ .

Factor $x + 1$ out of ${(x + 1)}^{2}$ .

$\frac{(x + 1) (x + 1)}{2 (x + 1)}$

Cancel the common factors.

Factor $x + 1$ out of $2 (x + 1)$ .

$\frac{(x + 1) (x + 1)}{(x + 1) \cdot 2}$

Cancel the common factor.

$\frac{(x + 1) (x + 1)}{(x + 1) \cdot 2}$

Rewrite the expression.

$\frac{x + 1}{2}$

Step 4

To find the holes in the graph, look at the denominator factors that were cancelled.

$x + 1$

Step 5

To find the coordinates of the holes, set each factor that was cancelled equal to $0$ , solve, and substitute back in to $\frac{x + 1}{2}$ .

Set $x + 1$ equal to $0$ .

$x + 1 = 0$

Subtract $1$ from both sides of the equation.

$x = - 1$

Substitute $- 1$ for $x$ in $\frac{x + 1}{2}$ and simplify.

Substitute $- 1$ for $x$ to find the $y$ coordinate of the hole.

$\frac{- 1 + 1}{2}$

Simplify.

Add $- 1$ and $1$ .

$\frac{0}{2}$

Divide $0$ by $2$ .

$0$

The holes in the graph are the points where any of the cancelled factors are equal to $0$ .

$(- 1, 0)$

Step 6

Find the Holes in the Graph (x^2+2x+1)/(2x+2)

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