Recent content by Daniel McKinley

]Homework Statement Solving the cubic equation x^3 + 6x = 20 by using formula gives (10+ sqrt(108))^1/3 - (-10 + sqrt(108))^1/3 How do you show that this comes out exactly 2? No calculators allowed.Homework EquationsThe Attempt at a Solution Tried cubing the expression and tried using the...

Thank you SammyS!

The book has x-=cos^3 t and dx = 3 cos^2 t sin t dt That's where the minus sign appears to be missing.

Homework Statement Section 11-2, Page 651, Example 3 Homework Equations y = sin^3t and dy = 3cos^2t sint dt. Shouldn't there be a Minus Sign there? The Attempt at a Solution Answer is correct. But isn't there a missing Minus Sign?