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Bookworm14

  • one year ago

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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  1. Bookworm14
    • one year ago
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  2. welshfella
    • one year ago
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    first expand (x - 9)(x + 9) then compare it term by term with x^2 + rx + t

  3. Bookworm14
    • one year ago
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    I know that, but x^2-81 does not match terms???

  4. welshfella
    • one year ago
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    x^2 + rx + t x^2 = 0x - 81

  5. welshfella
    • one year ago
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    * that is + 0x (typo)

  6. welshfella
    • one year ago
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    so r = 0 and t = ?

  7. welshfella
    • one year ago
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    compare like terms

  8. phi
    • one year ago
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    they want you to notice that 0 can make things "disappear"

  9. welshfella
    • one year ago
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    yea

  10. welshfella
    • one year ago
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    |dw:1439394425370:dw|

  11. welshfella
    • one year ago
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    r corresponds to 0 and t corresponds to -81

  12. welshfella
    • one year ago
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    follow?

  13. Bookworm14
    • one year ago
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    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?

  14. welshfella
    • one year ago
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    0x = 0 so the x term disappears

  15. welshfella
    • one year ago
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    yes

  16. Bookworm14
    • one year ago
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    fwew i got it right! i was panicing over nothin! thank yall!!

  17. welshfella
    • one year ago
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    yw

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