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anonymous

  • 4 years ago

Trying to remember how to factor 1600X^2+880xy+121y^2

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  1. anonymous
    • 4 years ago
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    (40x + 11y)^2

  2. anonymous
    • 4 years ago
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    But how does that work out to the 880xy?

  3. KingGeorge
    • 4 years ago
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    Well, you can see that 1600 = 40^2 and 121 = 11^2, so the first guess you should make is \[(40x +11y)(40x+11y)\] and see if it works. In this case, it does.

  4. anonymous
    • 4 years ago
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    OK, looks like I was having a major mental block.

  5. KingGeorge
    • 4 years ago
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    If you FOIL it, the 880 just pops right out.

  6. anonymous
    • 4 years ago
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    Right, I was thinking 40*11 was 44

  7. anonymous
    • 4 years ago
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    oops

  8. anonymous
    • 4 years ago
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    Thanks

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