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How can I work this to find what X equals? It's a Cubic equation

Calculus
Tutor: None Selected Time limit: 0 Hours

This is the first derivative from a quartic, I'm just trying to find the min and max

0.36x^3 - 0.84x^2 +5.52x - 6.84 = 0

I thought about making them all fractions? Like:

9x^3/25 - 21x^2/25 +138x/25 - 171/25 = 0

but I wasn't sure how to work it out from there

Apr 22nd, 2015

0.36x^3 - 0.84x^2 +5.52x - 6.84 = 0

I thought about making them all fractions?

the solution
9x^3/25 - 21x^2/25 +138x/25 - 171/25 = 0 this is really correct as per your workings proceed with it


Apr 22nd, 2015

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