Images Х2 4 Х

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Х2 4 х. Х2+4х-21 0. Х2+4х=21. Х4=(4х-21)2. Х4 – 4х2 – 21 = 0.
Х2+4х-21 0. Х2+4х=21. Х4=(4х-21)2. Х4 – 4х2 – 21 = 0.

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