Hey, I need a little help with this one preciate.
They tell me that the answer should be -2, but how I ever try I get only -1, can anyone show me exactly how to get -2 as answer?
II'll CHOOSE BEST ANSWER
Thank you!
f(x) = 3+x^2 / x-1 - Decide f(-1)?
2009-08-23 10:54 am
回答 (6)
2009-08-23 11:05 am
✔ 最佳答案
it's easy (: you just have to replace the x with -1and you'll get f(-1) = 3+(-1)^2/-1-1
and then you have f(-1) = 3+1/-2
that leads to f(-1) = 4/-2 which is -2
and there you have it (:
hope i helped (:
2009-08-23 7:24 pm
f(x) = (3 + x^2)/(x - 1) (when x = -1)
Substitute -1 for x.
f(-1) = [3 + (-1)^2]/(-1 - 1)
f(-1) = 4/(-2)
f(-1) = -2
Substitute -1 for x.
f(-1) = [3 + (-1)^2]/(-1 - 1)
f(-1) = 4/(-2)
f(-1) = -2
2009-08-23 6:35 pm
Presentation is such that question is open to misinterpretation.
AS GIVEN it MUST be read as :-
f ( x ) = 3 + (x^2/x) - 1 but I wouldn`t mind betting that this is not what you mean.
Have then to try and GUESS what you mean :-
Could it be :-
f ( x) = ( 3 + x^2 ) / ( x - 1 ) ???????????
f ( - 1 ) = 4 / (- 2 )
f ( - 1 ) = - 2
PS
Take care with presentation of questions.
USE BRACKETS
AS GIVEN it MUST be read as :-
f ( x ) = 3 + (x^2/x) - 1 but I wouldn`t mind betting that this is not what you mean.
Have then to try and GUESS what you mean :-
Could it be :-
f ( x) = ( 3 + x^2 ) / ( x - 1 ) ???????????
f ( - 1 ) = 4 / (- 2 )
f ( - 1 ) = - 2
PS
Take care with presentation of questions.
USE BRACKETS
2009-08-23 6:05 pm
f(-1) = [3 + (-1)^2]/(-1)-1 = 4/-2 = -2
Remember that (-1)^2 = +1
Remember that (-1)^2 = +1
2009-08-23 6:04 pm
f(-1)= (3+(-1)^2) / (-1)-1
=(3+1) / -2
=4/-2
= -4/2
=-2
solved
you would have put (-1)^2 as -1 ..its wrong... always squares are positive cuz negative *negative is positive i.e (-1)*(-1)=1
=(3+1) / -2
=4/-2
= -4/2
=-2
solved
you would have put (-1)^2 as -1 ..its wrong... always squares are positive cuz negative *negative is positive i.e (-1)*(-1)=1
2009-08-23 6:04 pm
f(-1) = (3 + (-1)^2)/ (-1)-1
f(-1) = 3+1/-2 negative one squared is POSITIVE 1!!!
f(-1) = 4/-2
f(-1) = -2!!!
f(-1) = 3+1/-2 negative one squared is POSITIVE 1!!!
f(-1) = 4/-2
f(-1) = -2!!!
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