Bookworm14
  • Bookworm14
I am not sure what this is asking for, can someone help me please?! Thank you! Okay this is my back to school review on khan academy, I solved the problem, easy as pie, I got x^2-81 , but what on earth is it asking for in the other part? I will put a screenshot in the comments, thank you!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Bookworm14
  • Bookworm14
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welshfella
  • welshfella
first expand (x - 9)(x + 9) then compare it term by term with x^2 + rx + t
Bookworm14
  • Bookworm14
I know that, but x^2-81 does not match terms???

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welshfella
  • welshfella
x^2 + rx + t x^2 = 0x - 81
welshfella
  • welshfella
* that is + 0x (typo)
welshfella
  • welshfella
so r = 0 and t = ?
welshfella
  • welshfella
compare like terms
phi
  • phi
they want you to notice that 0 can make things "disappear"
welshfella
  • welshfella
yea
welshfella
  • welshfella
|dw:1439394425370:dw|
welshfella
  • welshfella
r corresponds to 0 and t corresponds to -81
welshfella
  • welshfella
follow?
Bookworm14
  • Bookworm14
yes i follow, that is what i thought it meant, but i ddnt want to get it wrong becuase it would have made me start my streak over. so for "r" i enter 0? and for t i put the -81?
welshfella
  • welshfella
0x = 0 so the x term disappears
welshfella
  • welshfella
yes
Bookworm14
  • Bookworm14
fwew i got it right! i was panicing over nothin! thank yall!!
welshfella
  • welshfella
yw

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