July 23rd, 2015, 12:06 PM  #1 
Newbie Joined: Jun 2015 From: South Africa Posts: 27 Thanks: 0  Application
Hi guys. Here's the question: Find the coordinates of the stationary points on the graph of y=3x^44x^312x^2+10, and sketch the graph. For what values of k does the equation 3x^44x^312x^2+10=k have (a) exactly 4 roots (b) exactly 2 roots? I did the first part and its correct. But I don't understand the second part about the roots. Thanks for any help! 
July 23rd, 2015, 12:43 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,756 Thanks: 1407 
note the graph of the quartic in the attachment ... k = 7 (in red) intersects the quartic function four times (four roots) ... are there more possible values for k? what range of values would work? k = 10 (in green) intersects the quartic function twice (two roots) ... are there more possible values for k? are there values of k > 10 that would also intersect the quartic function twice? in total, what range of values would work? 
July 23rd, 2015, 11:29 PM  #3 
Newbie Joined: Jun 2015 From: South Africa Posts: 27 Thanks: 0 
Thanks so much! I get it now... easy actually!


Tags 
application, calculus, differentiationhelp 
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