|Oct26-08, 04:40 PM||#1|
line tangent to the curve
1. The problem statement, all variables and given/known data
For what values of a and b is the line 3x+y=b tangent to the curve y=ax^3 when x=5 ?
3. The attempt at a solution
I believe i would need to find the equation of the tangent to y=ax^3 when x=5 then that should be equal to -3x+b=y if im not mistaken but im not sure what to do from here to solve for a and b.
Any leads in the right direction or insight if this is the entirely wrong approach would be greatly appreciated!
|Oct26-08, 05:03 PM||#2|
|Oct26-08, 05:31 PM||#3|
thank you for the quick reply hallsofivy. I had -0.04 instead of -3/75 giving me the wrong answer for the online homework webpage which was confusing me. After using -3/75 instead it counts it as correct :(
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