How do i solve
2y^3+6y=1

Question

How do i solve
2y^3+6y=1

anonymous · Answer

i know the answer, i just don't know how to get it. its annoying getting wrapped up on the algebra in calculus :(

geerky42 · Answer

It's pretty hard  and ugly to solve this by hand. I guess you can find the answer using calculator.

anonymous · Answer

how do i solve it using my calculator?

geerky42 · Answer

Good question, I don't know. I often use Wolfram Alpha to find the answer in a problem like that. Do you literally have to solve this? Are you sure it's isn't 2y^2+6y=1?

anonymous · Answer

yes i'm sure. its a free response- it says prove that (4x-2xy)/(x^2+y^2+1) is the derivative of 2y^3+6x^2y-12x^2+6y=1
anyways i prove that- its part a
the second part is write an equation of each horizontal tangent line to the curve
so i set the derivative equal to zero
x=0
plug it into the original function and now I'm frustrated with y^3