Math Problem Statement

how to do simple trinomials

Solution

When solving simple trinomials, the most common form you'll encounter is:

ax2+bx+c=0ax^2 + bx + c = 0

Steps for Solving Simple Trinomials:

  1. Factor the trinomial:

    • You want to factor it into two binomials of the form: (px+q)(rx+s)(px + q)(rx + s)
    • Look for two numbers that multiply to give a×ca \times c (the product of the coefficient of x2x^2 and the constant term) and add up to bb (the coefficient of xx).
  2. Find the factors of a×ca \times c:

    • If a=1a = 1, you only need to focus on factors of cc.
    • If a1a \neq 1, find pairs of numbers that multiply to a×ca \times c and check if their sum is bb.
  3. Split the middle term:

    • Rewrite the middle term bxbx as the sum of two terms based on the factors found in step 2.
  4. Factor by grouping:

    • Group the terms and factor out the greatest common factor (GCF) from each group.
  5. Solve for xx (if you are solving an equation):

    • Set each factor equal to 0 and solve for xx.

Example 1: Factor the trinomial

Consider the trinomial:

x2+5x+6x^2 + 5x + 6

  • Step 1: Look for two numbers that multiply to 1×6=61 \times 6 = 6 and add to 5.

    • The numbers are 2 and 3 because 2×3=62 \times 3 = 6 and 2+3=52 + 3 = 5.
  • Step 2: Split the middle term using 2 and 3: x2+2x+3x+6x^2 + 2x + 3x + 6

  • Step 3: Factor by grouping: (x2+2x)+(3x+6)(x^2 + 2x) + (3x + 6) Factor out the GCF from each group: x(x+2)+3(x+2)x(x + 2) + 3(x + 2)

  • Step 4: Factor out the common binomial factor: (x+2)(x+3)(x + 2)(x + 3)

So, the factored form of the trinomial is: (x+2)(x+3)(x + 2)(x + 3)

Example 2: Solve the trinomial equation

Now, let's solve the equation: x2+5x+6=0x^2 + 5x + 6 = 0

  • From the factorization above: (x+2)(x+3)=0(x + 2)(x + 3) = 0

  • Set each factor equal to zero: x+2=0orx+3=0x + 2 = 0 \quad \text{or} \quad x + 3 = 0 Solving these: x=2orx=3x = -2 \quad \text{or} \quad x = -3

Thus, the solutions are x=2x = -2 and x=3x = -3.


Would you like more examples or any specific details on a particular step?

Related Questions:

  1. How do I factor trinomials when a1a \neq 1?
  2. What is the difference between factoring and solving a trinomial equation?
  3. Can you explain factoring with the AC method?
  4. How can I check if my factorization is correct?
  5. How does factoring apply to quadratic functions?

Tip: Always double-check your factor pairs to ensure their sum matches the middle term.

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Math Problem Analysis

Mathematical Concepts

Algebra
Factoring Trinomials
Quadratic Equations

Formulas

Standard form: ax^2 + bx + c = 0
Factoring into binomials: (px + q)(rx + s)

Theorems

Zero Product Property

Suitable Grade Level

Grades 8-10