Simplifying algebraic fractions and restrictions

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Why is it important to determine the non-permissible values prior to simplifying a rational expression?

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For each rational expression:
i) determine the non-permissible values of the variable, then
ii) simplify the rational expression
1. $\frac{{6{x^3}}}{{4x}}$
2. $\frac{{5 - {x}}}{{{x^2} - 8x + 15}}$
3. $\frac{{{x^2} + 13x + 40}}{{{x^2} - 25}}$
For each rational expression:
i) determine the non-permissible values of the variable, then
ii) simplify the rational expression
1. $\frac{{9{t^3} - 16t}}{{3{t^2} + 4t}}$
2. $\frac{{{x^2} + 2x - 3}}{{{x^4} - 10{x^2} + 9}}$
For each rational expression:
i) determine the non-permissible values of the variable, then
ii) simplify the rational expression
1. $\frac{{x - 3}}{{3 - x}}$
2. $\frac{{5{y^3} - 10{y^2}}}{{30 - 15y}}$
3. $\frac{{1 - 9{x^2}}}{{6{x^2} - 7x - 3}}$
The area of a rectangular window can be expressed as $4{x^2} + 13x + 3$ $4 x^{2} + 13 x + 3$ , while its length can be expressed as $4x + 1$ $4 x + 1$ .
1. Find the width of the window.
2. If the perimeter of the window is 68 $m$ , what is the value of $x$ ?
3. If a cleaning company charges $3/ $m^2$ for cleaning the window, how much does it cost to clean the window?
For each rational expression:
i) determine the non-permissible values for $y$ $y$ in terms of $x$ $x$ , then
ii) simplify, where possible.
1. $\frac{{2x + y}}{{2x - y}}$
2. $\frac{{x - 3y}}{{{x^2} - 9{y^2}}}$