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Задача Задача №2117211
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Аноним
06 ноября 2024 14:11 · публичный вопрос
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Аноним

{(x+2)(x-6)<(x+2)(x+1)+4 {2(6x-1)>7(2x-4)

Ответ нейросети
06 ноября 2024 14:11

Let's solve each inequality step by step.

Inequality 1: \((x+2)(x-6)<(x+2)(x+1)+4\)

  1. Expand both sides:
    Left side: \((x+2)(x-6) = x^2 - 6x + 2x - 12 = x^2 - 4x - 12\)
    Right side: \((x+2)(x+1) + 4 = (x^2 + x + 2x + 2) + 4 = x^2 + 3x + 2 + 4 = x^2 + 3x + 6\)

    Now, the inequality becomes:
    \[ x^2 - 4x - 12 < x^2 + 3x + 6 \]

  2. Subtract \(x^2\) from both sides:
    \[ -4x - 12 < 3x + 6 \]

  3. Rearranging:
    \[ -4x - 3x < 6 + 12 \]
    \[ -7x < 18 \]

  4. Dividing by -7 (which reverses the inequality):
    \[ x > -\frac{18}{7} \]

Inequality 2: \(2(6x-1)>7(2x-4)\)

  1. Expand both sides:
    Left side: \(2(6x - 1) = 12x - 2\)
    Right side: \(7(2x - 4) = 14x - 28\)

    The inequality now becomes:
    \[ 12x - 2 > 14x - 28 \]

  2. Rearranging:
    \[ 12x - 14x > -28 + 2 \]
    \[ -2x > -26 \]

  3. Dividing by -2 (which reverses the inequality):
    \[ x < 13 \]

Conclusion

Combining the results from both inequalities:

  1. From the first inequality: \(x > -\frac{18}{7}\)
  2. From the second inequality: \(x < 13\)

Thus, the solution to the compound inequality is: \[ -\frac{18}{7} < x < 13 \]