Question 1166072
.


            Ignore the post by @josgarithmetic since it is INCORRECT.


            The correct solution is below.



<pre>
    4x^2- 100 < 20


Add 100 to both sides


    4x^2 < 20 + 1200


    4x^2 < 120


Divide by 4 both sides


    x^2 < 30


Take the square root of both sides


    {{{-sqrt(30)}}} < x < {{{sqrt(30)}}}.      <U>ANSWER</U>
</pre>

Solved.



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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ignore the post by @josgarithmetic after his correction, too, &nbsp;since it is &nbsp;STILL &nbsp;INCORRECT.