Solve by completing the square, please show all the steps: 1) x2 – 3x – 5 = 0

Algebra and Trigonometry (6th Edition)
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Can you please explain how to do this problem

**Solve by completing the square, please show all the steps:**

1) \( x^2 - 3x - 5 = 0 \)

### Solution Steps:

1. **Move the constant to the right side:**
   \[
   x^2 - 3x = 5
   \]

2. **Find the value to complete the square:**
   - Take half of the coefficient of \( x \), which is \(-3\), giving \(-\frac{3}{2}\).
   - Square it: \(\left(-\frac{3}{2}\right)^2 = \frac{9}{4}\).

3. **Add and subtract this square inside the equation:**
   \[
   x^2 - 3x + \frac{9}{4} = 5 + \frac{9}{4}
   \]
   - The left side now becomes a perfect square trinomial.

4. **Write the left side as a squared binomial:**
   \[
   \left(x - \frac{3}{2}\right)^2 = \frac{29}{4}
   \]

5. **Solve for \( x \) by taking the square root on both sides:**
   \[
   x - \frac{3}{2} = \pm \sqrt{\frac{29}{4}}
   \]
   \[
   x - \frac{3}{2} = \pm \frac{\sqrt{29}}{2}
   \]

6. **Isolate \( x \):**
   \[
   x = \frac{3}{2} \pm \frac{\sqrt{29}}{2}
   \]

7. **Final solutions:**
   \[
   x = \frac{3 + \sqrt{29}}{2} \quad \text{or} \quad x = \frac{3 - \sqrt{29}}{2}
   \]

These steps illustrate how to solve the quadratic equation by completing the square method.
Transcribed Image Text:**Solve by completing the square, please show all the steps:** 1) \( x^2 - 3x - 5 = 0 \) ### Solution Steps: 1. **Move the constant to the right side:** \[ x^2 - 3x = 5 \] 2. **Find the value to complete the square:** - Take half of the coefficient of \( x \), which is \(-3\), giving \(-\frac{3}{2}\). - Square it: \(\left(-\frac{3}{2}\right)^2 = \frac{9}{4}\). 3. **Add and subtract this square inside the equation:** \[ x^2 - 3x + \frac{9}{4} = 5 + \frac{9}{4} \] - The left side now becomes a perfect square trinomial. 4. **Write the left side as a squared binomial:** \[ \left(x - \frac{3}{2}\right)^2 = \frac{29}{4} \] 5. **Solve for \( x \) by taking the square root on both sides:** \[ x - \frac{3}{2} = \pm \sqrt{\frac{29}{4}} \] \[ x - \frac{3}{2} = \pm \frac{\sqrt{29}}{2} \] 6. **Isolate \( x \):** \[ x = \frac{3}{2} \pm \frac{\sqrt{29}}{2} \] 7. **Final solutions:** \[ x = \frac{3 + \sqrt{29}}{2} \quad \text{or} \quad x = \frac{3 - \sqrt{29}}{2} \] These steps illustrate how to solve the quadratic equation by completing the square method.
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