This week in Precalc 11 I have learned how to solve for and write non-permissible values for rational expressions. I chose to display my learning of non-permissible values because when a rational expression is a fraction you never want zero in the denominator, so when stating the non-permissible value you are stating what number cannot be in the denominator that would make it equal to zero. You only write non permissible values if there is a variable in the denominator.
How you can solve is by….
Starting with factoring the denominator, do not simplifier further with the numerator yet, once the denominator is factored state the x values as normally (#’s are going to be opposite when stating it), now write the variable does NOT equal to those numbers, it is very important you remember that you write the ‘does not equal to’ sign because if you forgot you are stating something else entirely.
Down below I have displayed a rational expression and how to solve for the non-permissible values.
