Question

помогите пожалуйста
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Answer 1

Ответ:

$7x {}^{2} - 14x + (x - 2) {}^{2} = 0 \\ 7x {}^{2} - 14x + x {}^{2} - 4x + 4 = 0 \\ 8x {}^{2} - 18x + 4 = 0 \\ 4x {}^{2} - 9x + 2 = 0 \\ d = ( - 9) {}^{2} - 4 \times 4 \times 2 =81 - 32 = 49 = 7 {}^{2} \\ x1 = \frac{9 + 7}{2 \times 4} = \frac{16}{8} = 2 \\ x2 = \frac{9 - 7}{2 \times 4} = \frac{2}{8} = \frac{1}{4}$