Math Problem Statement

Find the length of each side of the given right triangle, where the sides are expressed as 2x - 2, 2x, and 2x + 2.

Solution

To solve the given right triangle problem:

Triangle Setup:

  • Hypotenuse = 2x+22x + 2
  • One leg = 2x2x
  • Other leg = 2x22x - 2

We will use the Pythagorean theorem: a2+b2=c2a^2 + b^2 = c^2 where a=2x2a = 2x - 2, b=2xb = 2x, and c=2x+2c = 2x + 2.

Step 1: Apply the Pythagorean theorem

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

Step 2: Expand each term

  1. (2x2)2=4x28x+4(2x - 2)^2 = 4x^2 - 8x + 4
  2. (2x)2=4x2(2x)^2 = 4x^2
  3. (2x+2)2=4x2+8x+4(2x + 2)^2 = 4x^2 + 8x + 4

Substitute these into the equation: (4x28x+4)+4x2=4x2+8x+4(4x^2 - 8x + 4) + 4x^2 = 4x^2 + 8x + 4

Step 3: Simplify the equation

Combine like terms: 4x2+4x28x+4=4x2+8x+44x^2 + 4x^2 - 8x + 4 = 4x^2 + 8x + 4 8x28x+4=4x2+8x+48x^2 - 8x + 4 = 4x^2 + 8x + 4

Simplify further: 8x24x28x8x+44=08x^2 - 4x^2 - 8x - 8x + 4 - 4 = 0 4x216x=04x^2 - 16x = 0

Step 4: Factorize the equation

4x(x4)=04x(x - 4) = 0

Step 5: Solve for xx

x=0orx=4x = 0 \quad \text{or} \quad x = 4

Since x=0x = 0 is not valid for side lengths, we have: x=4x = 4

Step 6: Find the side lengths

Substitute x=4x = 4 into the expressions for the sides:

  1. Hypotenuse (cc): 2x+2=2(4)+2=102x + 2 = 2(4) + 2 = 10
  2. One leg (bb): 2x=2(4)=82x = 2(4) = 8
  3. Other leg (aa): 2x2=2(4)2=62x - 2 = 2(4) - 2 = 6

Final Answer:

The triangle has side lengths: 6,8,and 106, 8, \text{and } 10

Would you like further clarification? Here are five related questions:

  1. What happens if we try different values of xx?
  2. How does the Pythagorean theorem guarantee right triangle properties?
  3. Can we use trigonometric ratios to verify the side lengths?
  4. What other methods can determine the side lengths in such problems?
  5. How does factoring help simplify quadratic equations?

Tip: Always check for extraneous solutions when solving quadratic equations!

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Right Triangle Geometry

Formulas

Pythagorean Theorem: a^2 + b^2 = c^2

Theorems

Pythagorean Theorem

Suitable Grade Level

Grades 8-10