anonymous
  • anonymous
solve -81+4x^2=0 by factoring
Mathematics
schrodinger
  • schrodinger
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schrodinger
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anonymous
  • anonymous
Remember the rule about factoring differences of squares: \(a^2-b^2 = (a+b)(a-b)\). Does that help you out?
anonymous
  • anonymous
no can u explain it farther
anonymous
  • anonymous
So are the two parts of the equation (\(81\) and \(4x^2\)) squares?

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anonymous
  • anonymous
ok
anonymous
  • anonymous
Now set \(a=4x^2\) and \(b=81\), and plug it in to the equation I gave above.
anonymous
  • anonymous
Uh... correction: \(a^2 = 4x^2\) and \(b^2 = 81\).
anonymous
  • anonymous
Yep. (2x - 9) (2x + 9)
anonymous
  • anonymous
\[-81+4x^2=0\]
anonymous
  • anonymous
can u explain step by step because i am on these problems in my math class

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