Math Problem Statement

How do you factor a trinomial step by step

Solution

Factoring a trinomial involves breaking it down into simpler binomials. Let's go step by step using an example trinomial:

Example:

Factor the trinomial x2+5x+6x^2 + 5x + 6.

Step-by-Step Guide:

  1. Identify the form
    A standard trinomial is written as ax2+bx+cax^2 + bx + c, where:

    • aa is the coefficient of x2x^2
    • bb is the coefficient of xx
    • cc is the constant term
      In our example, x2+5x+6x^2 + 5x + 6, we have:
    • a=1a = 1
    • b=5b = 5
    • c=6c = 6
  2. Find two numbers that multiply to give acac and add to give bb
    Here, we need two numbers that:

    • Multiply to a×c=1×6=6a \times c = 1 \times 6 = 6
    • Add up to b=5b = 5

    The numbers that satisfy both conditions are 2 and 3 because:

    • 2×3=62 \times 3 = 6 (they multiply to 6)
    • 2+3=52 + 3 = 5 (they add to 5)
  3. Rewrite the middle term
    Rewrite the middle term 5x5x as the sum of the two numbers found in the previous step:
    x2+5x+6=x2+2x+3x+6x^2 + 5x + 6 = x^2 + 2x + 3x + 6

  4. Factor by grouping
    Group the terms in pairs: (x2+2x)+(3x+6)(x^2 + 2x) + (3x + 6) Now, factor out the greatest common factor (GCF) from each pair: x(x+2)+3(x+2)x(x + 2) + 3(x + 2)

  5. Factor out the common binomial
    Both groups contain the common factor (x+2)(x + 2), so factor it out: (x+2)(x+3)(x + 2)(x + 3)

Final Answer:

The factored form of x2+5x+6x^2 + 5x + 6 is (x+2)(x+3)(x + 2)(x + 3).

Recap of the steps:

  1. Identify the form and coefficients.
  2. Find two numbers that multiply to aca \cdot c and add to bb.
  3. Rewrite the middle term.
  4. Factor by grouping.
  5. Factor out the common binomial.

Would you like further details or have any questions?

Here are 5 related questions to consider:

  1. How do you factor trinomials when a1a \neq 1?
  2. What if there are no two numbers that satisfy the condition?
  3. How can factoring help solve quadratic equations?
  4. How do you factor trinomials with negative constants?
  5. What are perfect square trinomials and how are they factored?

Tip: Always check your factors by multiplying them back to see if they match the original trinomial.

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Math Problem Analysis

Mathematical Concepts

Factoring
Algebra
Polynomials
Trinomials

Formulas

Trinomial: ax^2 + bx + c
Factoring by grouping: x^2 + bx + c = (x + m)(x + n)

Theorems

Fundamental Theorem of Algebra

Suitable Grade Level

Grades 8-10