Use the Binomial Theorem.
Raise to the power of .
Raise to the power of .
Multiply by .
Multiply by .
Raise to the power of .
Multiply by .
Apply the product rule to .
Raise to the power of .
Multiply by .
Raise to the power of .
Multiply by .
Apply the product rule to .
Raise to the power of .
Multiply by .
Raise to the power of .
Multiply by .
Apply the product rule to .
Raise to the power of .
Multiply by .
Multiply by .
Apply the product rule to .
Raise to the power of .
Multiply by .
Apply the product rule to .
Raise to the power of .
Multiply by .
Expand (3-x)^6