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Graph the equation \( y=x^{2}+12 x+32 \) on the accompanying set of axes. You must plot 5 points including the roots and the vertex.

Ask by Mejia Alexander. in the United States
Feb 27,2025

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Answer

To graph the equation \( y = x^{2} + 12x + 32 \), plot the following five points: 1. (–8, 0) and (–4, 0) – the roots where the parabola crosses the x-axis. 2. (–6, –4) – the vertex of the parabola. 3. (–7, –3) and (–5, –3) – additional points for symmetry. Draw a smooth, upward-opening parabola passing through these points, ensuring it is symmetric about the vertical line x = –6.

Solution

We wish to graph the parabola   y = x² + 12x + 32 by plotting at least five points, making sure to include the roots (x‑intercepts) and the vertex. Step 1. Find the x‑intercepts (roots):  • To find the roots, set y = 0:   x² + 12x + 32 = 0  • Factor the quadratic:   (x + 4)(x + 8) = 0  • Thus, the solutions are:   x + 4 = 0 ⟹ x = –4  and x + 8 = 0 ⟹ x = –8  • So the roots are at (–4, 0) and (–8, 0). Step 2. Find the vertex:  • The x‑coordinate of the vertex for a quadratic in the form y = ax² + bx + c is given by x = –b/(2a).   Here a = 1 and b = 12, so   x = –12/(2×1) = –6.  • Substitute x = –6 into the equation to find y:   y = (–6)² + 12(–6) + 32 = 36 – 72 + 32 = –4.  • The vertex is at (–6, –4). Step 3. Choose two additional points:  • Since the parabola is symmetric about the vertical line x = –6, a good choice is to pick two points that are equidistant from –6.  • Let x = –7 (one unit to the left of –6):   y = (–7)² + 12(–7) + 32 = 49 – 84 + 32 = –3.   This gives the point (–7, –3).  • Similarly, let x = –5 (one unit to the right of –6):   y = (–5)² + 12(–5) + 32 = 25 – 60 + 32 = –3.   This gives the point (–5, –3). Step 4. Summarize your five points:  1. (–8, 0)  (root)  2. (–7, –3)  3. (–6, –4)  (vertex)  4. (–5, –3)  5. (–4, 0)  (root) Step 5. Graphing the parabola:  • On your set of axes, plot the following points:   – (–8, 0) and (–4, 0) on the x‑axis.   – (–6, –4) as the lowest point (vertex) of the parabola.   – (–7, –3) and (–5, –3) just above the vertex.  • Draw a smooth, U‑shaped curve passing through these points.  • Notice the symmetry about the vertical line x = –6. The completed graph will show a parabola opening upward with its vertex at (–6, –4) and x‑intercepts at (–8, 0) and (–4, 0).

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The Deep Dive

To graph the equation \( y = x^{2} + 12x + 32 \), let's first identify some key points: roots and vertex. 1. **Finding the vertex**: The vertex of a quadratic function in the form \( y = ax^2 + bx + c \) can be found using the formula \( x = -\frac{b}{2a} \). Here, \( a = 1 \) and \( b = 12 \), so: \[ x = -\frac{12}{2 \cdot 1} = -6. \] Substitute \( x = -6 \) back into the equation to find \( y \): \[ y = (-6)^{2} + 12(-6) + 32 = 36 - 72 + 32 = -4. \] Thus, the vertex is at the point \((-6, -4)\). 2. **Finding the roots**: To find the roots, we solve the equation \( x^{2} + 12x + 32 = 0 \) using the quadratic formula \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \). Here, \( a = 1 \), \( b = 12 \), and \( c = 32 \): \[ x = \frac{-12 \pm \sqrt{12^{2} - 4 \cdot 1 \cdot 32}}{2 \cdot 1} = \frac{-12 \pm \sqrt{144 - 128}}{2} = \frac{-12 \pm \sqrt{16}}{2} = \frac{-12 \pm 4}{2}. \] This gives two roots: \[ x = \frac{-8}{2} = -4 \quad \text{and} \quad x = \frac{-16}{2} = -8. \] Therefore, the roots are at the points \((-4, 0)\) and \((-8, 0)\). 3. **Choose some additional points**: To complete our five points, we can choose \( x = -7 \) and \( x = -5 \): - For \( x = -7 \): \[ y = (-7)^{2} + 12(-7) + 32 = 49 - 84 + 32 = -3, \] giving the point \((-7, -3)\). - For \( x = -5 \): \[ y = (-5)^{2} + 12(-5) + 32 = 25 - 60 + 32 = -3, \] giving the point \((-5, -3)\). 4. **Summary of points to plot**: - Vertex: \((-6, -4)\) - Roots: \((-4, 0)\) and \((-8, 0)\) - Additional points: \((-7, -3)\) and \((-5, -3)\) Now you can plot these points on the axes and draw a smooth parabola through them, opening upwards! Remember, since the vertex is at \((-6, -4)\), that will be the lowest point of the curve, making a lovely U-shape. Enjoy graphing!

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