12.10 Simplifying rational expressions and restrictions
Simplifying rational expressions and restrictions
A rational expression is a fraction that its numerator and/or denominator are polynomials. In this lesson, we will first learn how to find the nonpermissible values of the variable in a rational expression. Then, we will how to simplify rational expressions.
Lessons

1.
For each rational expression:
i) determine the nonpermissible values of the variable, then
ii) simplify the rational expression
b)
$\frac{{6{x^3}}}{{4x}}$

c)
$\frac{{5  {x}}}{{{x^2}  8x + 15}}$

d)
$\frac{{{x^2} + 13x + 40}}{{{x^2}  25}}$