Pregunta
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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
-
Rewrite the inequality in standard form:
-
Solve the quadratic equation:Use the quadratic formula:Here,
, , and . Substitute these values: This gives the roots: -
Analyze the quadratic inequality:The quadratic
factors as: The rootsand divide the number line into three intervals: Since the coefficient ofis 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, atand , the expression equals zero, which satisfies the inequality. -
-
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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