Problem

$-9<7 x^{2}+5 \leq 11$

Solution

Step 1 :Given the inequality $-9<7 x^{2}+5 \leq 11$

Step 2 :Rewrite the inequality as $7x^2 + 5 - 11 < 9$ and $7x^2 + 5 - 11 \leq 9$

Step 3 :Simplify to $7x^2 - 6 < 9$ and $7x^2 - 6 \leq 9$

Step 4 :Solve these inequalities separately to get $x = [-\sqrt{105}/7, \sqrt{105}/7]$

Step 5 :The solutions to the inequalities are the same, which means the solution to the original inequality is the interval between these two values, inclusive

Step 6 :\(\boxed{x \in \left[-\frac{\sqrt{105}}{7}, \frac{\sqrt{105}}{7}\right]}\)

From Solvely APP
Source: https://solvelyapp.com/problems/18937/

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