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3(х-7)^2+8х-56 =
=![3( x^{2}-14x+49) + 8x -56 = 3( x^{2}-14x+49) + 8x -56 =](https://tex.z-dn.net/?f=3%28+x%5E%7B2%7D-14x%2B49%29+%2B+8x+-56+%3D)
=![3x^{2}-42x+147+8x-56 = 3x^{2}-42x+147+8x-56 =](https://tex.z-dn.net/?f=3x%5E%7B2%7D-42x%2B147%2B8x-56+%3D)
=![3x^{2}-34x+91 3x^{2}-34x+91](https://tex.z-dn.net/?f=3x%5E%7B2%7D-34x%2B91+)
![D=1156-4*3*91=1156-1092=64= 8^{2} D=1156-4*3*91=1156-1092=64= 8^{2}](https://tex.z-dn.net/?f=D%3D1156-4%2A3%2A91%3D1156-1092%3D64%3D+8%5E%7B2%7D+)
x1=![frac{26}{6}= frac{13}{3} frac{26}{6}= frac{13}{3}](https://tex.z-dn.net/?f=+frac%7B26%7D%7B6%7D%3D+frac%7B13%7D%7B3%7D+)
![x2= frac{34+8}{6}= frac{42}{6}=7 x2= frac{34+8}{6}= frac{42}{6}=7](https://tex.z-dn.net/?f=x2%3D+frac%7B34%2B8%7D%7B6%7D%3D+frac%7B42%7D%7B6%7D%3D7)
![(x-frac{13}{3})(x-7) (x-frac{13}{3})(x-7)](https://tex.z-dn.net/?f=%28x-frac%7B13%7D%7B3%7D%29%28x-7%29)
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