Math Problem Statement

Find x 1+1.5(square root x^2-1 - 1.5x^2/square root of x^2-1

Solution

To solve the equation 1+1.5(x211.5x2x21)=01 + 1.5\left(\sqrt{x^2 - 1} - \frac{1.5x^2}{\sqrt{x^2 - 1}}\right) = 0, we can first simplify the expression inside the parentheses.

  1. Rewrite the equation: 1+1.5(x211.5x2x21)=01 + 1.5\left(\sqrt{x^2 - 1} - \frac{1.5x^2}{\sqrt{x^2 - 1}}\right) = 0

  2. Simplify the expression: x211.5x2x21=(x21)21.5x2x21=x211.5x2x21=0.5x21x21\sqrt{x^2 - 1} - \frac{1.5x^2}{\sqrt{x^2 - 1}} = \frac{(\sqrt{x^2 - 1})^2 - 1.5x^2}{\sqrt{x^2 - 1}} = \frac{x^2 - 1 - 1.5x^2}{\sqrt{x^2 - 1}} = \frac{-0.5x^2 - 1}{\sqrt{x^2 - 1}}

  3. Substitute back into the equation: 1+1.50.5x21x21=01 + 1.5 \cdot \frac{-0.5x^2 - 1}{\sqrt{x^2 - 1}} = 0

  4. Multiply through by x21\sqrt{x^2 - 1} to eliminate the fraction: x21+1.5(0.5x21)=0\sqrt{x^2 - 1} + 1.5(-0.5x^2 - 1) = 0

  5. Distribute: x210.75x21.5=0\sqrt{x^2 - 1} - 0.75x^2 - 1.5 = 0

  6. Rearranging gives: x21=0.75x2+1.5\sqrt{x^2 - 1} = 0.75x^2 + 1.5

  7. Square both sides: x21=(0.75x2+1.5)2x^2 - 1 = (0.75x^2 + 1.5)^2

  8. Expand the right-hand side: (0.75x2+1.5)(0.75x2+1.5)=0.5625x4+2.25x2+2.25(0.75x^2 + 1.5)(0.75x^2 + 1.5) = 0.5625x^4 + 2.25x^2 + 2.25

  9. Set the equation: x21=0.5625x4+2.25x2+2.25x^2 - 1 = 0.5625x^4 + 2.25x^2 + 2.25

  10. Rearranging this gives: 0.5625x4+1.25x2+3.25=00.5625x^4 + 1.25x^2 + 3.25 = 0

This is a quadratic in terms of y=x2y = x^2: 0.5625y2+1.25y+3.25=00.5625y^2 + 1.25y + 3.25 = 0

Now you can use the quadratic formula y=b±b24ac2ay = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} to find yy.

Calculation of yy:

  1. a=0.5625a = 0.5625
  2. b=1.25b = 1.25
  3. c=3.25c = 3.25

Calculating the discriminant: b24ac=(1.25)24(0.5625)(3.25)b^2 - 4ac = (1.25)^2 - 4(0.5625)(3.25)

Calculating further gives: =1.56257.35=5.7875= 1.5625 - 7.35 = -5.7875

Since the discriminant is negative, there are no real solutions for x2x^2, which means there are no real values for xx.

If you need further details or have any questions, feel free to ask! Here are some related questions:

  1. How do you interpret complex solutions in equations?
  2. Can you provide examples of similar equations with real solutions?
  3. What steps can you take when faced with a negative discriminant?
  4. How does squaring both sides affect the solutions of an equation?
  5. What are the implications of having no real solutions in a mathematical model?

Tip: Always check for extraneous solutions after squaring both sides of an equation, as this can introduce false solutions.

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Math Problem Analysis

Mathematical Concepts

Algebra
Radical Equations
Quadratic Equations
Discriminant Analysis

Formulas

Quadratic formula: y = (-b ± √(b^2 - 4ac)) / 2a
Discriminant calculation: b^2 - 4ac

Theorems

Quadratic formula theorem
Properties of radicals and square roots

Suitable Grade Level

Grades 10-12