Math Problem Statement

solve the general quadratic equation for a b and c where x = +- root 3

Solution

To solve the general quadratic equation where x=±3x = \pm \sqrt{3}, we can start by using the fact that x=±3x = \pm \sqrt{3} are the roots of the quadratic equation. Given that the roots of a quadratic equation ax2+bx+c=0ax^2 + bx + c = 0 are r1r_1 and r2r_2, we can use the factored form of the quadratic equation:

a(xr1)(xr2)=0a(x - r_1)(x - r_2) = 0

Here, the roots r1=3r_1 = \sqrt{3} and r2=3r_2 = -\sqrt{3} lead to:

a(x3)(x+3)=0a(x - \sqrt{3})(x + \sqrt{3}) = 0

Now, expand the factored form:

a((x3)(x+3))=0a\left( (x - \sqrt{3})(x + \sqrt{3}) \right) = 0

Using the difference of squares identity:

a(x2(3)2)=0a(x^2 - (\sqrt{3})^2) = 0

This simplifies to:

a(x23)=0a(x^2 - 3) = 0

Finally, expanding gives the general quadratic equation:

ax23a=0ax^2 - 3a = 0

Comparing this to the standard form of a quadratic equation ax2+bx+c=0ax^2 + bx + c = 0, we can identify:

  • a=aa = a
  • b=0b = 0 (since there is no xx-term)
  • c=3ac = -3a

Thus, the general form of the quadratic equation where x=±3x = \pm \sqrt{3} is:

ax23a=0ax^2 - 3a = 0

If you have any questions or would like more details, feel free to ask!

Here are 5 related questions to expand on this:

  1. How do you derive the sum and product of the roots from a quadratic equation?
  2. What happens when the discriminant of a quadratic equation is zero?
  3. How can you determine the nature of the roots of a quadratic equation?
  4. How would the equation change if the roots were x=±2x = \pm 2 instead of x=±3x = \pm \sqrt{3}?
  5. How can you graph the quadratic equation x23=0x^2 - 3 = 0?

Tip: The discriminant b24acb^2 - 4ac of a quadratic equation determines the type of roots: real and distinct, real and equal, or complex.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Roots

Formulas

Factored form of a quadratic equation: a(x - r1)(x - r2) = 0
Difference of squares: (x - √a)(x + √a) = x^2 - a

Theorems

Difference of squares theorem
Quadratic equation formula ax^2 + bx + c = 0

Suitable Grade Level

Grades 9-10