anonymous
  • anonymous
PLEASE HELP WILL MEDAL AND FAN!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
tHATS IS THE QUESTION AND ANSWERS
SolomonZelman
  • SolomonZelman
no, not D.

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SolomonZelman
  • SolomonZelman
f\(^9\)÷f\(^3\)=f\(^6\) h\(^{23}\)÷h\(^{17}\)=h\(^6\) but why are your Fs and Gs on the bottom tho?
anonymous
  • anonymous
So the answer is C?
SolomonZelman
  • SolomonZelman
Yes
anonymous
  • anonymous
Can you help me with 1 more?
SolomonZelman
  • SolomonZelman
Yes, if I wont have to leave (no apostrophe on Italian keyboard)
anonymous
  • anonymous
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|
SolomonZelman
  • SolomonZelman
(a-b)•(a+b)=a²-b²
SolomonZelman
  • SolomonZelman
do the same when your a is 9x and b is 4
mathstudent55
  • mathstudent55
\(\Large \dfrac{a^m}{a^n} = a^{m - n} \) \(\Large \dfrac{f^9h^{23}}{f^3h^{17}} = f^{9 - 3}h^{23 - 17} = f^6 h^6 \)
SolomonZelman
  • SolomonZelman
and then compare your simplified result to ax²-b
anonymous
  • anonymous
Thank you @mathstudent55 but i already have the answer to that.
anonymous
  • anonymous
Opps @SolomonZelman
SolomonZelman
  • SolomonZelman
my last 3 posts (not incl. this one) are meant for the second question.
SolomonZelman
  • SolomonZelman
sol... i dont mind
anonymous
  • anonymous
Solomon actually the B isn't squared.
SolomonZelman
  • SolomonZelman
B isnt squared?
anonymous
  • anonymous
Nope just like this: \[(9x − 4)(9x + 4) = ax^2 − b\]
SolomonZelman
  • SolomonZelman
yes...
SolomonZelman
  • SolomonZelman
when I square the b it is just part of the formula of difference of squares
anonymous
  • anonymous
Oh okay lol. ʕ·ᴥ·ʔ
SolomonZelman
  • SolomonZelman
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"
SolomonZelman
  • SolomonZelman
in any case, you know that (9x+4)(9x-4) is the product that gievs you the area of the region. Right?
anonymous
  • anonymous
Yes correct.
SolomonZelman
  • SolomonZelman
and you are given that the area of the region is ax²-b
SolomonZelman
  • SolomonZelman
therefore (9x+4)(9x-4)=ax²-b
SolomonZelman
  • SolomonZelman
by the rule of the "difference of square" it follws that: (9x)² - (4)² =ax²-b
SolomonZelman
  • SolomonZelman
simplify the left side, and then the value of a should be easy.
SolomonZelman
  • SolomonZelman
(9x)²=9²•x²=81x² right?
SolomonZelman
  • SolomonZelman
(9x+4)(9x-4)=ax²-b (9x)² - (4)² =ax²-b 81x² - 16 =ax²-b
SolomonZelman
  • SolomonZelman
compare the coefficients, so a is?
anonymous
  • anonymous
81?
SolomonZelman
  • SolomonZelman
yes
anonymous
  • anonymous
Thats my answer?
SolomonZelman
  • SolomonZelman
yes

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