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anonymous

  • one year ago

PLEASE HELP WILL MEDAL AND FAN!

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    tHATS IS THE QUESTION AND ANSWERS

  3. SolomonZelman
    • one year ago
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    no, not D.

  4. SolomonZelman
    • one year ago
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    f\(^9\)÷f\(^3\)=f\(^6\) h\(^{23}\)÷h\(^{17}\)=h\(^6\) but why are your Fs and Gs on the bottom tho?

  5. anonymous
    • one year ago
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    So the answer is C?

  6. SolomonZelman
    • one year ago
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    Yes

  7. anonymous
    • one year ago
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    Can you help me with 1 more?

  8. SolomonZelman
    • one year ago
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    Yes, if I wont have to leave (no apostrophe on Italian keyboard)

  9. anonymous
    • one year ago
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    If (9x − 4)(9x + 4) = ax^2 − b, what is the value of a? The value of a is ___________. Numerical Answers Expected! Answer for Blank 1: |dw:1439478888532:dw|

  10. SolomonZelman
    • one year ago
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    (a-b)•(a+b)=a²-b²

  11. SolomonZelman
    • one year ago
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    do the same when your a is 9x and b is 4

  12. mathstudent55
    • one year ago
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    \(\Large \dfrac{a^m}{a^n} = a^{m - n} \) \(\Large \dfrac{f^9h^{23}}{f^3h^{17}} = f^{9 - 3}h^{23 - 17} = f^6 h^6 \)

  13. SolomonZelman
    • one year ago
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    and then compare your simplified result to ax²-b

  14. anonymous
    • one year ago
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    Thank you @mathstudent55 but i already have the answer to that.

  15. anonymous
    • one year ago
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    Opps @SolomonZelman

  16. SolomonZelman
    • one year ago
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    my last 3 posts (not incl. this one) are meant for the second question.

  17. SolomonZelman
    • one year ago
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    sol... i dont mind

  18. anonymous
    • one year ago
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    Solomon actually the B isn't squared.

  19. SolomonZelman
    • one year ago
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    B isnt squared?

  20. anonymous
    • one year ago
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    Nope just like this: \[(9x − 4)(9x + 4) = ax^2 − b\]

  21. SolomonZelman
    • one year ago
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    yes...

  22. SolomonZelman
    • one year ago
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    when I square the b it is just part of the formula of difference of squares

  23. anonymous
    • one year ago
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    Oh okay lol. ʕ·ᴥ·ʔ

  24. SolomonZelman
    • one year ago
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    i can use any variable for this formula: When I said (a-b)•(a+b)=a²-b² i could have said also (x-y)•(x+y)=x²-y² where x and y are just any thing in general (and so was "b" when i posted it, any thing in general, and not that particular b that you had in "ax²-b"

  25. SolomonZelman
    • one year ago
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    in any case, you know that (9x+4)(9x-4) is the product that gievs you the area of the region. Right?

  26. anonymous
    • one year ago
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    Yes correct.

  27. SolomonZelman
    • one year ago
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    and you are given that the area of the region is ax²-b

  28. SolomonZelman
    • one year ago
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    therefore (9x+4)(9x-4)=ax²-b

  29. SolomonZelman
    • one year ago
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    by the rule of the "difference of square" it follws that: (9x)² - (4)² =ax²-b

  30. SolomonZelman
    • one year ago
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    simplify the left side, and then the value of a should be easy.

  31. SolomonZelman
    • one year ago
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    (9x)²=9²•x²=81x² right?

  32. SolomonZelman
    • one year ago
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    (9x+4)(9x-4)=ax²-b (9x)² - (4)² =ax²-b 81x² - 16 =ax²-b

  33. SolomonZelman
    • one year ago
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    compare the coefficients, so a is?

  34. anonymous
    • one year ago
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    81?

  35. SolomonZelman
    • one year ago
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    yes

  36. anonymous
    • one year ago
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    Thats my answer?

  37. SolomonZelman
    • one year ago
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    yes

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