Factoring 5-Find 2 #s with given product & sum
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Part of video series
Meets NCTM Standards:
Lesson Description:
This video shows you how to methodically find 2 numbers with a given sum and product. This could be useful when factoring quadratic trinomials into the produce ot 2 binomials. So this video is preparation for that, which begins in Factoring Part 6.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
Questions answered by this video:
- How do you find two numbers with a given product and sum?
- How can you find two numbers whose product is 40 and sum is 13?
- How can you figure out what two numbers multiply to 40 and add to 13?
- What is a systematic, easy way to find two integers that multiply to a given product and add to a given sum?
- What are the two numbers that multiply to 72 and add to -22?
- How can you figure out whether factors should be negative or positive when you need to find numbers with a given product and a given sum?
- How can you figure out the two numbers that multiply to -12 and add to 4?
- What two integers multiply to -70 and add to -9?
- How does the problem change if you want to multiply to positive 70 and add to -9?
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Staff Review
This lesson covers a fundamental concept necessary for factoring trinomials -- finding two integers that multiply to a given product and add to a given sum. Several varying examples are shown and explained very well.
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