x²-17x+72=0
x -9
x -8
(x-9)(x-8)=0
x-9=0
x=9
x-8=0
x=8
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x²-17x+72=0
x -9
x -8
(x-9)(x-8)=0
x-9=0
x=9
x-8=0
x=8
espero te sirva suerte en tus estudios :D