Math Problem Statement

How would you solve, x(x-2)=5

Solution

To solve the equation x(x2)=5x(x - 2) = 5, follow these steps:

Step 1: Expand the left side

Distribute xx across the terms inside the parentheses:

x(x2)=x22xx(x - 2) = x^2 - 2x

So the equation becomes:

x22x=5x^2 - 2x = 5

Step 2: Move all terms to one side

Now, subtract 5 from both sides to set the equation to 0:

x22x5=0x^2 - 2x - 5 = 0

Step 3: Solve the quadratic equation

You can solve the quadratic equation x22x5=0x^2 - 2x - 5 = 0 using the quadratic formula, which is:

x=b±b24ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

For our equation, a=1a = 1, b=2b = -2, and c=5c = -5.

Step 4: Apply the quadratic formula

Substitute a=1a = 1, b=2b = -2, and c=5c = -5 into the formula:

x=(2)±(2)24(1)(5)2(1)x = \frac{-(-2) \pm \sqrt{(-2)^2 - 4(1)(-5)}}{2(1)}

x=2±4+202x = \frac{2 \pm \sqrt{4 + 20}}{2}

x=2±242x = \frac{2 \pm \sqrt{24}}{2}

x=2±262x = \frac{2 \pm 2\sqrt{6}}{2}

Step 5: Simplify the expression

Now simplify:

x=1±6x = 1 \pm \sqrt{6}

So the two solutions are:

x=1+6orx=16x = 1 + \sqrt{6} \quad \text{or} \quad x = 1 - \sqrt{6}

Final Answer:

The solutions are:

x=1+6orx=16x = 1 + \sqrt{6} \quad \text{or} \quad x = 1 - \sqrt{6}

Would you like any further explanations or details about this process?

Related Questions:

  1. How would you solve a quadratic equation with complex solutions?
  2. Can you factor the quadratic equation x22x5=0x^2 - 2x - 5 = 0?
  3. What is the discriminant of a quadratic equation, and how does it affect the solutions?
  4. How do you check the solutions to a quadratic equation?
  5. What happens if the discriminant is negative?

Tip: When solving quadratic equations, always check if factoring is possible before resorting to the quadratic formula. It can save time!

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Factoring
Distributive Property

Formulas

Quadratic formula: x = (-b ± √(b² - 4ac)) / 2a

Theorems

Quadratic formula
Distributive property of multiplication over addition

Suitable Grade Level

Grades 8-10