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evergirl

  • 3 years ago

please help

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  1. evergirl
    • 3 years ago
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  2. DrakeAndHisMind
    • 3 years ago
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    54

  3. evergirl
    • 3 years ago
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    how did u do that though?

  4. DrakeAndHisMind
    • 3 years ago
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    foiling

  5. DrakeAndHisMind
    • 3 years ago
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    http://en.wikipedia.org/wiki/FOIL_method

  6. tcarroll010
    • 3 years ago
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    (a + b)(a - b) is the form of your expression. You have to multiply that out: a(a - b) + b(a - b) = a^2 - ab + ab - b^2 = a^2 - b^2

  7. evergirl
    • 3 years ago
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    thanks

  8. tcarroll010
    • 3 years ago
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    In this case, a is 8 and b is sqrt(10)

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