math-factoring

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(test next period)

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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