Math Problem Statement

حل المعادلات

Solution

The image contains the equation x36x2+11x6=0x^3 - 6x^2 + 11x - 6 = 0.

To solve this cubic equation, we can follow these steps:

  1. Factorization by grouping or trial and error for possible rational roots: The Rational Root Theorem suggests that any rational solution to the polynomial equation anxn+an1xn1++a0=0a_nx^n + a_{n-1}x^{n-1} + \ldots + a_0 = 0 is a fraction p/qp/q, where pp is a factor of the constant term a0a_0 and qq is a factor of the leading coefficient ana_n. For x36x2+11x6=0x^3 - 6x^2 + 11x - 6 = 0, the possible rational roots are the factors of 6-6 (constant term) divided by the factors of 11 (leading coefficient). Therefore, the possible rational roots are ±1,±2,±3,±6\pm 1, \pm 2, \pm 3, \pm 6.

  2. Testing possible roots:

    • Testing x=1x = 1: 136(1)2+11(1)6=16+116=01^3 - 6(1)^2 + 11(1) - 6 = 1 - 6 + 11 - 6 = 0 Since x=1x = 1 is a root, we can factor x1x - 1 out of the polynomial.
  3. Synthetic division: Divide x36x2+11x6x^3 - 6x^2 + 11x - 6 by x1x - 1 using synthetic division:

    1 & 1 & -6 & 11 & -6 \\ & & 1 & -5 & 6 \\ \hline & 1 & -5 & 6 & 0 \\ \end{array}$$ The quotient is $$x^2 - 5x + 6$$.
  4. Solve the quadratic equation x25x+6=0x^2 - 5x + 6 = 0: x25x+6=0x^2 - 5x + 6 = 0 Factor the quadratic: (x2)(x3)=0(x - 2)(x - 3) = 0 Therefore, x=2x = 2 and x=3x = 3.

  5. List all roots: The roots of the equation x36x2+11x6=0x^3 - 6x^2 + 11x - 6 = 0 are x=1,x=2,x=3x = 1, x = 2, x = 3.

If you have any questions or need further details, please let me know. Here are five questions you might ask next:

  1. How do you verify the roots of a polynomial equation?
  2. Can you explain the Rational Root Theorem in more detail?
  3. What other methods can be used to solve cubic equations?
  4. How does synthetic division work for polynomials?
  5. Can you show how to solve a cubic equation using the general formula?

Tip: When solving polynomial equations, always start by checking for possible rational roots using the Rational Root Theorem; it can significantly simplify the problem.

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Math Problem Analysis

Mathematical Concepts

Polynomial Equations
Cubic Equations
Rational Root Theorem
Synthetic Division

Formulas

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Theorems

Rational Root Theorem

Suitable Grade Level

Grades 10-12