How to Factor Second Degree Polynomials (Quadratic Equations)
Set up your expression., Find the factored form using one of the methods below., Check your work!
Step-by-Step Guide
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Step 1: Set up your expression.
The standard format for the quadratic equation is:ax2 + bx + c = 0 Start by ordering the terms in your equation from highest to lowest power, just like this standard format.
For example, take:6 + 6x2 + 13x = 0 We will re-order this expression so it's easier to work with by simply moving the terms around:6x2 + 13x + 6 = 0 , Factoring the polynomial will result in two smaller expressions which can be multiplied to produce the original polynomial:6x2 + 13x + 6 = (2x + 3)(3x + 2) In this example, (2x +3) and (3x + 2) are factors of the original expression, 6x2 + 13x +
6. , Multiply the factors you identified.
Then combine like terms and you're done.
Start with:(2x + 3)(3x + 2) Let's test it, multiplying the terms using FOIL (first
- outer
- inner
- last), obtaining:6x2 + 4x + 9x + 6 From here, we can add 4x and 9x together since they're like terms.
We know our factors are correct because we get the equation we started with:6x2 + 13x + 6 -
Step 2: Find the factored form using one of the methods below.
-
Step 3: Check your work!
Detailed Guide
The standard format for the quadratic equation is:ax2 + bx + c = 0 Start by ordering the terms in your equation from highest to lowest power, just like this standard format.
For example, take:6 + 6x2 + 13x = 0 We will re-order this expression so it's easier to work with by simply moving the terms around:6x2 + 13x + 6 = 0 , Factoring the polynomial will result in two smaller expressions which can be multiplied to produce the original polynomial:6x2 + 13x + 6 = (2x + 3)(3x + 2) In this example, (2x +3) and (3x + 2) are factors of the original expression, 6x2 + 13x +
6. , Multiply the factors you identified.
Then combine like terms and you're done.
Start with:(2x + 3)(3x + 2) Let's test it, multiplying the terms using FOIL (first
- outer
- inner
- last), obtaining:6x2 + 4x + 9x + 6 From here, we can add 4x and 9x together since they're like terms.
We know our factors are correct because we get the equation we started with:6x2 + 13x + 6
About the Author
Jeffrey Powell
Enthusiastic about teaching hobbies techniques through clear, step-by-step guides.
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