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alejandragertse
@alejandragertse
August 2022
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Проверьте, пожалуйста, на правильность)
(x-3)(x+3)>3(x-2)^2-4x(x-2)
(x^2-9)>3(x^2-4x+4)-4x^2+8x
x^2-9>3x^2-12x+12x-4x^2+8x
2x^2+4x-21=0
D=16+168=184
x1=-4+√184/4=-4+2√46/4
x2=-4-2√46/4
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litanalove
X² -9 >(x -2)(3(x -2) -4x)
x² -9 >(x -2)(3x -6 -4x)
x² -9 >(x -2)(-x -6)
x² -9 > -x² -6x +2x +12
x² -9 > -x² -4x +12
x² -9 +x² +4x -12 =0
2x² +4x -21 =0
D =16 +4*2*21 =184
у вас верно
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Answers & Comments
x² -9 >(x -2)(3x -6 -4x)
x² -9 >(x -2)(-x -6)
x² -9 > -x² -6x +2x +12
x² -9 > -x² -4x +12
x² -9 +x² +4x -12 =0
2x² +4x -21 =0
D =16 +4*2*21 =184
у вас верно