Hi all, just a quick question about a C1 maths past paper question. I'm not entirely sure how to go about answering this question, anyway here it is. Find the set of values of k for which the graph of y=x2+2kx+5 does not intersect the x axis. Any help on how to answer this question or the method I should use will be much appreciated.
Hi all, just a quick question about a C1 maths past paper question. I'm not entirely sure how to go about answering this question, anyway here it is. Find the set of values of k for which the graph of y=x2+2kx+5 does not intersect the x axis. Any help on how to answer this question or the method I should use will be much appreciated.
I believe this means that the curve does not cross the x-axis, so therefore b2−4ac<0 Input the values which give us 4k2−20<0 Which means 4k2<20[br]k2<5[br]kislessthan5
I believe this means that the curve does not cross the x-axis, so therefore b2−4ac<0 Input the values which give us 4k2−20<0 Which means 4k2<20[br]k2<5[br]kislessthan5
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No. That isn't how you solve quadratic inequalities.