Hi, I really need help on this question. Kindly advise please. Thanks.

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secondary 3 | A Maths
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secondary 3 A Maths Singapore

Hi, I really need help on this question. Kindly advise please. Thanks.

Date Posted: 4 years ago

Comments 3 add a comment

Eric Nicholas K

4 years ago

Hang on, attempting

Candice Lim

4 years ago

Thanks a lot! Really appreciated your prompt response :)

Eric Nicholas K

4 years ago

I have tried to play around with the k on a graph plotter and found that the solutions are

-2.055 < k < -1

and

3 < k < 4.055

The -2.055 and 4.055 can be easily obtained by using the fact that the equation has two real and distinct roots.

What I am trying to figure out is why the second inequality is 3 < k < 4.055 and not 2 < k < 4.055.

I have obtained the inequalities k < -1 and k > 2 from my workings in the first post, and apparently k > 2 is not correct for some reason. I will post an update once I am able to get around this mess.

EDIT: My first page working is invalid. Looking at the question from another angle, sorry for the delay

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Candice, I will temporarily post this for now. I will attempt to figure out how to obtain -2.055 < k < -1, 3 < k < 4.055 when I have more time.

Date Posted: 4 years ago

Comments 0 add a comment

done {{ upvoteCount }} Upvotes

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And here you are, my workings for this question.

Date Posted: 4 years ago

Comments 1 add a comment

Candice Lim

4 years ago

Many thanks, Mr Eric! Very detailed and neat workings presented as always :) I will have to take some time to go through them and see if I can understand everything. Thanks again and have a great day ahead!