anonymous
  • anonymous
If (8z − 9)(8z + 9) = az2 − b, what is the value of a? The value of a is ____________.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Im pretty sure its 8 but i want to be sure
welshfella
  • welshfella
what did you get for the expansion of (8x - 9)(8z + 9)?
nincompoop
  • nincompoop
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 \(a \times a = a^2 \)

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More answers

anonymous
  • anonymous
i dont understand
anonymous
  • anonymous
how you got that
nincompoop
  • nincompoop
I am providing the general idea without answering your own homework.
princeharryyy
  • princeharryyy
multiply the left hand side and compare the coefficients according to the power of z
nincompoop
  • nincompoop
the coefficients in the first parenthesis will have to be multiplied to the coefficient in the second parenthesis
princeharryyy
  • princeharryyy
@lealealea222
anonymous
  • anonymous
this question confuses me so bad, i dont understand what your saying, im sorry
nincompoop
  • nincompoop
what is a multiplied by a ?
anonymous
  • anonymous
2?
nincompoop
  • nincompoop
let us use an actual number \(2 \times 2 = ?\)
anonymous
  • anonymous
4
nincompoop
  • nincompoop
\(4 \times 4 = ? \)
anonymous
  • anonymous
WAIT its ^2 im so sorry
anonymous
  • anonymous
its az^2 − b
nincompoop
  • nincompoop
but you are not worried about z nor b you have to worry about a
anonymous
  • anonymous
ok ok, 8
anonymous
  • anonymous
no 16
nincompoop
  • nincompoop
how about \(8 \times 8 = ? \)
anonymous
  • anonymous
64
nincompoop
  • nincompoop
did you notice that \(2 \times 2 = 2^2\) \(4 \times 4 = 4^2\) \(8 \times 8 = 8^2\)
anonymous
  • anonymous
yes
anonymous
  • anonymous
so its 64??
nincompoop
  • nincompoop
yes, because the coefficient are both 8
nincompoop
  • nincompoop
if the coefficients were different then you will multiply them as well
anonymous
  • anonymous
Thankyou :)
anonymous
  • anonymous
can you help with one more?
nincompoop
  • nincompoop
maybe post it
anonymous
  • anonymous
Consider the functions f(x) = 2x + 1 and g(x) = x2 − 10. What is the value of f[g(3)]? 39 −3 −7 -1
anonymous
  • anonymous
its like the other one but i dont know it
anonymous
  • anonymous
@nincompoop

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