Question 1122533
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About the third question, which the other tutor didn't address in her response....<br>
The real response to that question is that "X" does not appear in the given expression "2x+3/x2-16", so the question makes no sense.<br>
In working a problem using algebra, X and x can represent two different numbers.<br>
If we assume X and x are supposed to be the same number, then the answer to the question is not what you were expecting.<br>
"2x+3/x2-16" --> {{{2x+3/x2-16}}}<br>
In that expression, the expression is not defined when the denominator of the fraction is 0, which is when x=0.<br>
ANSWER: 0<br>
But that is undoubtedly not the answer you were looking for, because you didn't show the expression correctly.<br>
The careful use of parentheses is important in algebra.  It's almost certain that the expression you wanted is "(2x+3)/(x2-16)" --> {{{(2x+3)/(x2-16)}}}.<br>
Of course the answer to that question is completely different.<br>