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math-factoring

posted by on .

(test next period)
PLEASE HELP!!

x4-13X2+36

how DO YOU FACTOR THIS I TRIED EVERYTHING HELP!!!

  • math-factoring - ,

    Put y=x²
    then
    x4-13x²+36
    =y²-13y+36
    =y(y-9)-4(y-9)
    =?

  • math-factoring - ,

    Why didn't i think of that...GENIUS!!THANKS A MILLION TIMES!!

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