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anonymous

  • one year ago

Factor completely 49x*2 − 81.

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  1. pooja195
    • one year ago
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    Diffrence of squares \[\huge~\rm~\sqrt{49x^2}-\sqrt{81}\]

  2. DanJS
    • one year ago
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    Try , since both coefficients are squares, and a minus sign.....( ( a + b) * ( a - b)

  3. anonymous
    • one year ago
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    @pooja195 that setup is much more easier.

  4. pooja195
    • one year ago
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    What set up?

  5. anonymous
    • one year ago
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    When you square root the numbers instead of trying to factor them. Some people don't think of square rooting the numbers.

  6. pooja195
    • one year ago
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    Right :) thanks ^-^ @DanJS 's work is helpful too since it belongs in that form :)

  7. anonymous
    • one year ago
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    is it (7-9)*2

  8. DanJS
    • one year ago
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    I think that is what it looks like, if you have perfect squares a and b \[a^2*x^2 - b^2 = (a+b)*(a-b\]

  9. DanJS
    • one year ago
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    sorry (ax - b)*(ax+b)

  10. DanJS
    • one year ago
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    distribute backwards and check, it works out both ways

  11. pooja195
    • one year ago
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    No rember the x's...u have it some what correct (7x+9) (7x-9) We need a positive and a negative statement

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