Close friends Stacy, Una, and Amir were all born on July 4. Stacy is one year younger than Una. Una is two years younger than Amir. On July 4, 2010, the product of their ages was 2300 more than the sum of their ages. How old was each friend on that day?
Think | Write |
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Define variables. |
Let
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Write an equation. Simplify and change it to
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Only real solutions make sense, so graphing
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Image Long Description
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Write the answer. | Una was 13, Stacy 12, and Amir 15. |
Factor each polynomial.
Solve each equation by factoring.
Vocabulary Identify each expression as a sum of cubes, difference of cubes, or difference of squares.