[tex]x\neq0 \\ ( \frac{ {x}^{2} - 6}{x}) {}^{2} - 4( \frac{ {x}^{2} - 6}{x} ) - 5 = 0 \\ \frac{ {x}^{2} - 6}{x} = a \\ a {}^{2} - 4a - 5 = 0[/tex]
По теореме Виета:
[tex] {x}^{2} + bx + c = 0\\ x_{1} + x_{2} = - b\\ x_{1} x_{2} = c [/tex]
[tex]a_{1} + a_{2} = 4 \\ a_{1}a_{2} = - 5 \\ a_{1} = - 1 \\ a_{2} = 5[/tex]
1) а = - 1 :
[tex] \frac{ {x}^{2} - 6}{x} = - 1 \\ {x}^{2} - 6 = - x \\ {x}^{2} + x - 6 = 0 \\ po \: \: \: teoreme \: \: \: vieta \\ x_{1} + x_{2} = - 1\\ x_{1} x_{2} = - 6 \\ x_{1} = - 3 \\ x_{2} = 2[/tex]
2) а = 5 :
[tex] \frac{ {x}^{2} - 6}{x} = 5 \\ {x}^{2} - 6 = 5x \\ {x}^{2} - 5x - 6 = 0 \\ x_{3} + x_{4} =5 \\ x_{3} x_{4} = - 6\\ x_{3} =6 \\ x_{4} = - 1[/tex]
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Answers & Comments
[tex]x\neq0 \\ ( \frac{ {x}^{2} - 6}{x}) {}^{2} - 4( \frac{ {x}^{2} - 6}{x} ) - 5 = 0 \\ \frac{ {x}^{2} - 6}{x} = a \\ a {}^{2} - 4a - 5 = 0[/tex]
По теореме Виета:
[tex] {x}^{2} + bx + c = 0\\ x_{1} + x_{2} = - b\\ x_{1} x_{2} = c [/tex]
[tex]a_{1} + a_{2} = 4 \\ a_{1}a_{2} = - 5 \\ a_{1} = - 1 \\ a_{2} = 5[/tex]
1) а = - 1 :
[tex] \frac{ {x}^{2} - 6}{x} = - 1 \\ {x}^{2} - 6 = - x \\ {x}^{2} + x - 6 = 0 \\ po \: \: \: teoreme \: \: \: vieta \\ x_{1} + x_{2} = - 1\\ x_{1} x_{2} = - 6 \\ x_{1} = - 3 \\ x_{2} = 2[/tex]
2) а = 5 :
[tex] \frac{ {x}^{2} - 6}{x} = 5 \\ {x}^{2} - 6 = 5x \\ {x}^{2} - 5x - 6 = 0 \\ x_{3} + x_{4} =5 \\ x_{3} x_{4} = - 6\\ x_{3} =6 \\ x_{4} = - 1[/tex]