1. find each value of x at which has a horizontal tangent line. set = to 0 factoring out = = x=4 = x=0 Key says the answer is x=1, and x=4.
Follow Math Help Forum on Facebook and Google+
Originally Posted by hazecraze = = How did you arrive at this equality? How did you go from "2x - 8 = 0" to "2x = 0 and 6x = 0"? Instead, start with the factorization: Set this equal to zero, and solve both factors, using the methods you learned back in algebra.
How did I not see that? Got it now though.
View Tag Cloud