Pregunta
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Write an inequality in the form such that the solutions are all real numbers
greater than -3 .

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The inequality is .

Solución

We are given an inequality of the form
and we want its set of solutions to be all real numbers satisfying
One way to achieve this is to choose . When is negative, multiplying both sides of the inequality by (a negative number) reverses the inequality sign. Starting with
multiplying by gives
To have the solution , we need
A simple choice is to let . Then we find
Thus, the inequality becomes
To verify, start with
Multiplying both sides by (and reversing the inequality sign) yields
which is exactly the desired solution.
The final inequality is:

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The Deep Dive

To create an inequality of the form such that the solutions are all real numbers greater than -3, we can manipulate the inequality accordingly. For instance, let’s take and . The resulting inequality will be or just , which is actually not what we need.
Instead, if we want , we can use the form . Multiplying throughout by -1 (and flipping the inequality) gives us , which won’t work. A better option is to use and , which simplifies to , giving us when flipped. So, the final answer could be , resulting in as the solution! 💡

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