MATH  Rational Expressions
posted by J .
HELP PLEASE! I am taking my college placement test tomorrow and am working on the sample test now. I need help with this question about Rational Expressions...
For all r (<INSERT>is not equal to sign)+ or  2
r(squared)  5r+6
(All Over)
r(squared) 4
I know the answer is r3/r+2, but I do not know the steps to use to get the answer.
Jessica
First let me rewrite that in a way I recognize
r^2  5r + 6
____________
r^2 4
Both the numerator and denominator can be factored to give
(r3)(r2)
__________
(r+2)(r2)
The r2 terms can be cancelled to give
(r3)/(r+2)
The bit about r not being allowed to be = or 2 is because that would put a zero in the denominator, making the fraction be "indeterminate" or without meaning. For any other r, (r3)/(r+2) is the answer.
Thank you for your help it is greatly appreciated :)
36a^2bc^56abc^3/6abc^3
The Square root of 98?
need more help. need to see more problams about rationals.
need more help. need to see more problams about rationals.
17a+5b
 
bc ac
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