The Goal

Find

The Mistake

Find the mistake:

(Roll the mouse over the math to see a hint in red)

The Correction

(Roll the mouse over the area above to see the correction in blue)

An Explanation

An attempt to use the product rule was made despite the fact that the constant multiple rule would have sufficed. The mistake was in computing the derivative of the constant 3 to be 1 (resulting in the term 6^x); the derivative of 3 is 0, which eliminates that 6^x term.