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jazzyfa30

  • 2 years ago

Solve the equation by factoring: x2 - 81 = 0

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  1. hartnn
    • 2 years ago
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    81 is the square of which number?

  2. jazzyfa30
    • 2 years ago
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    9

  3. hartnn
    • 2 years ago
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    right! so, we have \(x^2-9^2 =0\) now use \(a^2-b^2=(a+b)(a-b)\) to factor that!, what u get ?

  4. hartnn
    • 2 years ago
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    a=x, b=9

  5. jazzyfa30
    • 2 years ago
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    -9 or 9

  6. Pradius
    • 2 years ago
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    (x+9)(x-9)

  7. hartnn
    • 2 years ago
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    correct! good :)

  8. jazzyfa30
    • 2 years ago
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    ok

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