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Finding Zeros with Technology Question © © Video Examples Find the zeros of the function \( f(x)=x^{2}-3 x-3 \). Round values to the nearest thousandths (if necessary). Answer Attempt 1 out of 2 \( \oplus \) Add a Zero \( \Theta \) No Zeros \( x=\square \) Submit Answer

Ask by Schofield Ayala. in the United States
Feb 03,2025

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The zeros of the function \( f(x) = x^2 - 3x - 3 \) are approximately \( x = -0.792 \) and \( x = 3.792 \).

Solution

To find the zeros of the function \( f(x) = x^2 - 3x - 3 \), we'll use the quadratic formula: \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] For the given function: - \( a = 1 \) - \( b = -3 \) - \( c = -3 \) Plugging these values into the formula: \[ x = \frac{-(-3) \pm \sqrt{(-3)^2 - 4(1)(-3)}}{2(1)} = \frac{3 \pm \sqrt{9 + 12}}{2} = \frac{3 \pm \sqrt{21}}{2} \] Calculating the square root: \[ \sqrt{21} \approx 4.583666 \] Now, find the two solutions: \[ x_1 = \frac{3 + 4.583666}{2} \approx \frac{7.583666}{2} \approx 3.792 \] \[ x_2 = \frac{3 - 4.583666}{2} \approx \frac{-1.583666}{2} \approx -0.792 \] **Rounded to the nearest thousandth, the zeros of the function are:** \[ x = -0.792 \quad \text{and} \quad x = 3.792 \]

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To find the zeros of the function \( f(x) = x^2 - 3x - 3 \) using technology, you can input the equation into a graphing calculator or software like Desmos. This will visually show you where the graph intersects the x-axis, indicating the zeros. You can also use the quadratic formula \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \) with \( a = 1, b = -3, c = -3 \) to calculate the zeros directly. After applying the quadratic formula, you'll find two zeros. Solving it gives you: 1. \( x = \frac{3 + \sqrt{(3)^2 - 4(1)(-3)}}{2(1)} \) which rounds to approximately 4.732, 2. \( x = \frac{3 - \sqrt{(3)^2 - 4(1)(-3)}}{2(1)} \) which rounds to approximately -0.732. These are the zeros of the function you were looking for!

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