show that the curve y=6x3+5x-3 has no tangent line with slope 4.
please help me show how i prove this!!!!
First, take the derivative of y with respect to x, then set that equal to 4 and solve for x. What do you find?
edit: I realize this is the same thing I said in my first post, but to say any more would be to essentailly give away the problem, and this would do you little good.