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!

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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
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1 Attachment
first expand (x - 9)(x + 9) then compare it term by term with x^2 + rx + t
I know that, but x^2-81 does not match terms???

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Other answers:

x^2 + rx + t x^2 = 0x - 81
* that is + 0x (typo)
so r = 0 and t = ?
compare like terms
  • phi
they want you to notice that 0 can make things "disappear"
yea
|dw:1439394425370:dw|
r corresponds to 0 and t corresponds to -81
follow?
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?
0x = 0 so the x term disappears
yes
fwew i got it right! i was panicing over nothin! thank yall!!
yw

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