anonymous
  • anonymous
One solution to the problem below is 3. What is the other solution? b^2-9=0
Mathematics
schrodinger
  • schrodinger
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phi
  • phi
do you know how to factor a "difference of squares" ?
anonymous
  • anonymous
well square roots mean even a negative number will be positive -3^2 =9-9=0
phi
  • phi
when you see (a^2 - b^2) try to remember you can factor that into (a+b)(a-b)

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phi
  • phi
the other way to answer is to add +9 to both sides b^2 -9+9 = 0+9 b^2 = 9 now take the square root of both sides \[ \sqrt{b^2} = \sqrt{9} \\ b= \pm 3 \]
anonymous
  • anonymous
sissy i dont know..you know we both are dumb..thats why we both in summer school honey <3
anonymous
  • anonymous
its -3
anonymous
  • anonymous
there ya go sis ^
anonymous
  • anonymous
thanks you get aaaaaaa Medal!!! ooooo

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