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soccerbabe239

  • 3 years ago

factor 4y^2-9

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  1. ZeHanz
    • 3 years ago
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    It is of the form a² - b² = (a + b)(a - b). Here: a² = 4y² and b² = 9. So if you can figure out a and b, you can factor it!

  2. soccerbabe239
    • 3 years ago
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    would it be (4y+3)(4y-3) ?

  3. whpalmer4
    • 3 years ago
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    Close, but not quite. 4*4 = 16.

  4. whpalmer4
    • 3 years ago
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    \[a^2 = 4y^2\]Take square root of both sides \[a=\sqrt{4y^2} = ?\]

  5. soccerbabe239
    • 3 years ago
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    oh haha so it would be (2y+3)(2y-3)

  6. ZeHanz
    • 3 years ago
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    Right!

  7. whpalmer4
    • 3 years ago
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    By the way, learning to recognize difference of squares like this is an important trick in your bag of factoring tricks.

  8. soccerbabe239
    • 3 years ago
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    okay! haha blonde moment! :)

  9. ZeHanz
    • 3 years ago
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    We all have that once in a while!

  10. soccerbabe239
    • 3 years ago
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    haha this is my 6 th one today :/

  11. whpalmer4
    • 3 years ago
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    And whenever you think you've solved something, or factored it, it's not a bad idea at all to expand it out or plug in the solution and make sure that your answer works!

  12. ZeHanz
    • 3 years ago
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    You used them up for the whole week already!

  13. whpalmer4
    • 3 years ago
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    Might have to wear a wig for a few days ;-)

  14. soccerbabe239
    • 3 years ago
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    haha thanks guys! and its natural I cant help it. and the wig wouldnt hide anything. honestly ive tried that and it didn't work:(

  15. ZeHanz
    • 3 years ago
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    Just learn to live with it ;)

  16. soccerbabe239
    • 3 years ago
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    haha I do! I just accept im a natural blonde but at least im not a bimbo!

  17. ZeHanz
    • 3 years ago
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    Good luck with your maths problems!

  18. whpalmer4
    • 3 years ago
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    I have a friend who is a natural brunette, but she prefers to be blonde, and often pulls it off quite convincingly :-)

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