March 1st, 2009, 11:01 AM  #1 
Newbie Joined: Mar 2009 Posts: 6 Thanks: 0  Find eqation of tangent line
Im stuck on a few... y = 5?x^3 ; when x = 0 ( 5th root, in case it doesn't turn out) and p(x) = ax^2 + bx + c ; x = b/2a ; a, b, and c are constants, a not = 0 
March 1st, 2009, 12:42 PM  #2 
Senior Member Joined: May 2008 From: Sacramento, California Posts: 299 Thanks: 0  Re: Find eqation of tangent line (power rule), so at , . (power rule again), so at , . This would make sense because the function's vertex is at . To get the equation of the tangent line, use pointslope (); plug in the slope of the curve at the point for and the coordinates of the point for and . For , the line is undefined, but for , the equation would be . 
March 1st, 2009, 12:54 PM  #3 
Newbie Joined: Mar 2009 Posts: 6 Thanks: 0  Re: Find eqation of tangent line
Thanks sidT, helped a lot! 

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