George Schofield
05/27/2023 · Middle School
Graph the parabola (do not place any dots) then fill in the blanks about the vertex, any intercepts, the domain, and range. Enter intercepts as ordered pairs, aka points. \( y=x^{2}+6 x+5 \)
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Tutor-Verified Answer
Step-by-step Solution
To analyze the parabola given by the equation \( y = x^2 + 6x + 5 \), we can follow these steps:
1. **Vertex**: The vertex of a parabola in the form \( y = ax^2 + bx + c \) can be found using the formula for the x-coordinate of the vertex:
\[
x = -\frac{b}{2a}
\]
Here, \( a = 1 \) and \( b = 6 \):
\[
x = -\frac{6}{2 \cdot 1} = -3
\]
To find the y-coordinate of the vertex, substitute \( x = -3 \) back into the equation:
\[
y = (-3)^2 + 6(-3) + 5 = 9 - 18 + 5 = -4
\]
Thus, the vertex is at the point:
\[
\text{Vertex: } (-3, -4)
\]
2. **Intercepts**:
- **Y-intercept**: Set \( x = 0 \):
\[
y = 0^2 + 6(0) + 5 = 5
\]
So, the y-intercept is:
\[
\text{Y-intercept: } (0, 5)
\]
- **X-intercepts**: Set \( y = 0 \):
\[
0 = x^2 + 6x + 5
\]
Factor the quadratic:
\[
0 = (x + 1)(x + 5)
\]
Setting each factor to zero gives:
\[
x + 1 = 0 \quad \Rightarrow \quad x = -1
\]
\[
x + 5 = 0 \quad \Rightarrow \quad x = -5
\]
Thus, the x-intercepts are:
\[
\text{X-intercepts: } (-1, 0) \text{ and } (-5, 0)
\]
3. **Domain**: The domain of a parabola that opens upwards (which this one does, since \( a > 0 \)) is all real numbers:
\[
\text{Domain: } (-\infty, \infty)
\]
4. **Range**: Since the vertex is the lowest point of the parabola and is located at \( y = -4 \), the range starts from this value and goes to infinity:
\[
\text{Range: } [-4, \infty)
\]
### Summary:
- **Vertex**: \((-3, -4)\)
- **X-intercepts**: \((-1, 0)\) and \((-5, 0)\)
- **Y-intercept**: \((0, 5)\)
- **Domain**: \((- \infty, \infty)\)
- **Range**: \([-4, \infty)\)
Quick Answer
Vertex: (-3, -4), X-intercepts: (-1, 0) and (-5, 0), Y-intercept: (0, 5), Domain: (-∞, ∞), Range: [-4, ∞)
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