Math Problem Statement

  1. Provide a counterexample to disprove the statement: If x 2 > 4, then x > 2.

Solution

The statement "If x2>4x^2 > 4, then x>2x > 2" is false, and here’s a counterexample to disprove it:

Let x=3x = -3.

  • If x=3x = -3, then: x2=(3)2=9.x^2 = (-3)^2 = 9. Since 9>49 > 4, it is true that x2>4x^2 > 4.

  • However, x=3x = -3, and 3-3 is not greater than 22. In fact, 3<2-3 < 2.

Thus, the statement "If x2>4x^2 > 4, then x>2x > 2" is false because x=3x = -3 satisfies x2>4x^2 > 4, but does not satisfy x>2x > 2.

Would you like more details or have any other questions?

Here are 5 related questions:

  1. Can you provide another counterexample for this statement?
  2. What would be the correct conclusion for x2>4x^2 > 4?
  3. How do we solve inequalities involving absolute values?
  4. Can x2x^2 ever be negative?
  5. How does squaring a number affect its sign?

Tip: When dealing with squared terms, always remember that both positive and negative numbers can result in the same squared value.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inequalities
Quadratic Functions

Formulas

x^2 > 4

Theorems

Properties of inequalities
Square root property

Suitable Grade Level

Grades 8-10