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anonymous

  • one year ago

If (8z − 9)(8z + 9) = az2 − b, what is the value of a? The value of a is ____________.

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  1. anonymous
    • one year ago
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    Im pretty sure its 8 but i want to be sure

  2. welshfella
    • one year ago
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    what did you get for the expansion of (8x - 9)(8z + 9)?

  3. nincompoop
    • one year ago
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    it is distributive property the coefficients are multiplied \((ax+b) (ax-c) = (ax \times ax) - (ax \times c) + (ax \times c) - (b\times c)\) if you focused on a, it will be \(a \times a = a^2 \)

  4. anonymous
    • one year ago
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    i dont understand

  5. anonymous
    • one year ago
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    how you got that

  6. nincompoop
    • one year ago
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    I am providing the general idea without answering your own homework.

  7. princeharryyy
    • one year ago
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    multiply the left hand side and compare the coefficients according to the power of z

  8. nincompoop
    • one year ago
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    the coefficients in the first parenthesis will have to be multiplied to the coefficient in the second parenthesis

  9. princeharryyy
    • one year ago
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    @lealealea222

  10. anonymous
    • one year ago
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    this question confuses me so bad, i dont understand what your saying, im sorry

  11. nincompoop
    • one year ago
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    what is a multiplied by a ?

  12. anonymous
    • one year ago
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    2?

  13. nincompoop
    • one year ago
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    let us use an actual number \(2 \times 2 = ?\)

  14. anonymous
    • one year ago
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    4

  15. nincompoop
    • one year ago
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    \(4 \times 4 = ? \)

  16. anonymous
    • one year ago
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    WAIT its ^2 im so sorry

  17. anonymous
    • one year ago
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    its az^2 − b

  18. nincompoop
    • one year ago
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    but you are not worried about z nor b you have to worry about a

  19. anonymous
    • one year ago
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    ok ok, 8

  20. anonymous
    • one year ago
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    no 16

  21. nincompoop
    • one year ago
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    how about \(8 \times 8 = ? \)

  22. anonymous
    • one year ago
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    64

  23. nincompoop
    • one year ago
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    did you notice that \(2 \times 2 = 2^2\) \(4 \times 4 = 4^2\) \(8 \times 8 = 8^2\)

  24. anonymous
    • one year ago
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    yes

  25. anonymous
    • one year ago
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    so its 64??

  26. nincompoop
    • one year ago
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    yes, because the coefficient are both 8

  27. nincompoop
    • one year ago
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    if the coefficients were different then you will multiply them as well

  28. anonymous
    • one year ago
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    Thankyou :)

  29. anonymous
    • one year ago
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    can you help with one more?

  30. nincompoop
    • one year ago
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    maybe post it

  31. anonymous
    • one year ago
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    Consider the functions f(x) = 2x + 1 and g(x) = x2 − 10. What is the value of f[g(3)]? 39 −3 −7 -1

  32. anonymous
    • one year ago
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    its like the other one but i dont know it

  33. anonymous
    • one year ago
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    @nincompoop

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