sweetescobar
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I have done part 3 of this question, but I am stuck on the final part when I find the two values for k, K <0 and K < 64/9

Why is it that the answer is 0 < K < 64/9?

I thought we would draw the graph, and do K < 0, and K > 64/9, since the values must be outside of the graph?

Am I making any sense?

Anyways, I attached the question and mark scheme below.
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RDKGames
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For no solutions you need b^2-4ac &lt; 0 i.e. (-3k)^2 - 4(k)(16) &lt; 0.

Expand this quadratic and sketch it. You should see that it is negative BETWEEN its roots.
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sweetescobar
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Oh ok, I see what you mean. Thanks a lot!

Do you mind RDKGames explaining how you wrote the b^2 - 4ac like that?
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RDKGames
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(Original post by sweetescobar)
Oh ok, I see what you mean. Thanks a lot!

Do you mind RDKGames explaining how you wrote the b^2 - 4ac like that?
https://www.thestudentroom.co.uk/help/latex
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