Rational Exprns: find x-values where x^2-4x+9/2x+5 not defined

[Skeeta]

hello
can some please explain rational expressions to me in terms that i can understand.

x^2-4x+9
_________(find all number for which the rational expession is not definded.
2x + 5

ALSO
f(x)=x^2 - 4x + 9
______________( find the domain of f if. write interval notation for the answer.
2x + 5


Thanks
Skeeta

 

[Deleted member 4993]

Re: Rational Expressions: [(5z^3)/(-6m^3)]*[(-6m^5)/(25z^9)]

hello
can some please explain rational expressions to me in terms that i can understand.

x^2-4x+9
_________(find all number for which the rational expession is not definded.
2x + 5

ALSO
f(x)=x^2 - 4x + 9
______________( find the domain of f if. write interval notation for the answer.
2x + 5


Thanks
Skeeta

Start a new thread with new problems.

Rational expressions are nothing but fractions - except here instead of numbers you would have polynomials (or functions or expressions).

For a review go to:

http://www.purplemath.com/modules/rtnlmult.htm

Rational fraction will not be defined - for the values of "x" - where the denominator goes to 'zero'.

For the question of domain - what is the definition of domain?

 

[stapel]

Start a new thread with new problems.

New thread now split from old. :wink: