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junior college 1 | H1 Maths
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I m stuck with this question. Appreciate any help. Thanks
Date Posted: 2 years ago
Views: 640
(a)
image of -1 under f just means f(-1).
substitute x=-1 into function f, gives f=-3.5
(b)
long way ...
first find inverse function of f,
then substitute x=-7 into the inverse function.
short way ...
let 2x+6/(x-3) = -7,
reduce to quadratic equation & solve for x.
will get x=2.5 or -3.
since f is defined only for x<0, so reject x=2.5
final answer x=-3
image of -1 under f just means f(-1).
substitute x=-1 into function f, gives f=-3.5
(b)
long way ...
first find inverse function of f,
then substitute x=-7 into the inverse function.
short way ...
let 2x+6/(x-3) = -7,
reduce to quadratic equation & solve for x.
will get x=2.5 or -3.
since f is defined only for x<0, so reject x=2.5
final answer x=-3
Thank you so much for your help and clear explanation
Sorry I have another question but not able to post again as you post your answer at the comment option instead of answer. Do you mind to post your answer at the answer section so that I can post another question? Thank you very much
See 1 Answer
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Thanks for replying
Date Posted:
2 years ago
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