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anonymous

  • one year ago

If (9x − 4)(9x + 4) = ax 2 − b, what is the value of a?

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  1. anonymous
    • one year ago
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    @ganeshie8 @p@prowrestler @dan815 @sammixboo @Jhannybean @mathmath333

  2. Vocaloid
    • one year ago
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    foil method (9x-4)*(9x+4) = 81x^2-16

  3. anonymous
    • one year ago
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    a can be 18 because 18x can =ax*2-b if b=1

  4. anonymous
    • one year ago
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    Okay, so @DaBest21 says 18. What about you @Vocaloid?

  5. Vocaloid
    • one year ago
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    |dw:1437144374749:dw|

  6. Vocaloid
    • one year ago
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    find a

  7. anonymous
    • one year ago
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    6561...?

  8. Vocaloid
    • one year ago
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    |dw:1437144456312:dw| look at the underlined parts

  9. anonymous
    • one year ago
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    A=81?

  10. Vocaloid
    • one year ago
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    right

  11. anonymous
    • one year ago
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    Okay, cool. Thanks! I will let you know if it is correct.

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