anonymous
  • anonymous
factor completely. r^2-22r+121
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
how did you get that
misty1212
  • misty1212
HI!!
misty1212
  • misty1212
it is actually \[r^2-22x+121=(r-11)^2\]

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misty1212
  • misty1212
you get it because \(121=11^2\) and \(-22=-2\times 11\)
misty1212
  • misty1212
in general \[(a+b)^2=a^2+2ab+b^2\] so for example \[x^2-10x+25=(x-5)^2\]
zkoqmosii
  • zkoqmosii
You need to find out what two numbers add to equal -22 and multiply to equal 121. In this case it's -11 and -11. After finding the two numbers, you write it like this: (r-11)(r-11). You can also use the quadratic formula to find the solution.

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