Question
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Graph the quadratic \( y=4 x^{2}+3 x-8 \). What is the vertex of this quadratic? (f point) \( (0,-8) \) \( (-1.838,0) \) \( (1.088,0) \) \( (-0.375,-8.563) \)

Ask by Young Gordon. in the United States
Jan 26,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The vertex of the quadratic \( y = 4x^{2} + 3x - 8 \) is at \( (-0.375, -8.563) \).

Solution

To find the vertex of the quadratic function \( y = 4x^{2} + 3x - 8 \), we'll use the vertex formula for a parabola. ### Step 1: Identify the coefficients The general form of a quadratic equation is: \[ y = ax^{2} + bx + c \] For the given equation: - \( a = 4 \) - \( b = 3 \) - \( c = -8 \) ### Step 2: Find the x-coordinate of the vertex The x-coordinate of the vertex (\( h \)) can be found using: \[ h = -\frac{b}{2a} \] Plugging in the values: \[ h = -\frac{3}{2 \times 4} = -\frac{3}{8} = -0.375 \] ### Step 3: Find the y-coordinate of the vertex Substitute \( x = -0.375 \) back into the original equation to find the y-coordinate (\( k \)): \[ \begin{align*} y &= 4(-0.375)^{2} + 3(-0.375) - 8 \\ &= 4(0.140625) - 1.125 - 8 \\ &= 0.5625 - 1.125 - 8 \\ &= -8.5625 \end{align*} \] Rounding to three decimal places: \[ k \approx -8.563 \] ### Conclusion The vertex of the quadratic function \( y = 4x^{2} + 3x - 8 \) is: \[ \boxed{\,(-0.375,\ -8.563)\,} \]

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Bonus Knowledge

To find the vertex of the quadratic function \( y = 4x^{2} + 3x - 8 \), we can use the vertex formula \( x = -\frac{b}{2a} \). Here, \( a = 4 \) and \( b = 3 \). Substituting these values gives us \( x = -\frac{3}{2 \cdot 4} = -\frac{3}{8} \). Plugging this value of \( x \) back into the equation yields the vertex's y-coordinate. The vertex can be represented as the point where the parabola reaches its maximum or minimum value. For this quadratic, since the coefficient of \( x^2 \) (which is 4) is positive, the parabola opens upwards. Thus, the vertex represents the minimum point of the graph. You can plug in various x-values to confirm the shape of the parabola and get a better idea of its behavior. In addition to finding the vertex, it's essential to understand where the graph intersects the x-axis, which will help you sketch it accurately. The quadratic formula can help you find these x-intercepts, giving you a more complete picture of the graph's behavior.

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