Question is: Andre solved an equation, but when he checked his answer he saw his solution was incorrect. He knows he made a mist
ake, but can’t find it. Where is andres mistake and what is the solution to the equation?
2 answers:
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The interval notation is
Explanation:
The inequality is
Let us complete the square, we get,
Simplifying, we have,
Adding both sides of the equation by 11, we get,
Since, we know that for , if n is even then
Thus, writing the above expression in this form, we get,
Also, if then
and
Then ,we have,
and
Solving the inequalities, we get,
and
Merging the intervals, we have,
Hence, writing the solution in interval notation, we have,
Therefore, the answer is