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Ask by Wheeler Campbell. in the United States
Mar 27,2025

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The solution to the inequality is all real numbers less than or equal to 3 and greater than or equal to 9.

Solución

  1. Rewrite the inequality in standard form:
  2. Solve the quadratic equation:
    Use the quadratic formula:
    Here, , , and . Substitute these values:
    This gives the roots:
  3. Analyze the quadratic inequality:
    The quadratic factors as:
    The roots and divide the number line into three intervals:
    Since the coefficient of is positive, the parabola opens upward. This means:
    • For , both factors are negative, making their product positive.
    • For , one factor is positive and the other negative, making the product negative.
    • For , both factors are positive, making their product positive.
    Also, at and , the expression equals zero, which satisfies the inequality.
  4. Write the solution:

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Bonus Knowledge

To solve the inequality , we first rearrange it into standard form: . Next, we find the roots of the corresponding equation using the quadratic formula, yielding . These roots divide the number line into intervals. We test these intervals to determine where the inequality holds true. Ultimately, the solution is or .
To visualize this solution set, imagine a number line with points at and . Everything to the left of the first point and everything to the right of the second point satisfies the inequality. This is a great way to see how quadratic inequalities create a range of solutions!

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