Final answer:
The expression (xy'(3x'y) simplifies to 3x²y².
Step-by-step explanation:
To simplify the expression (xy'(3x'y), we can use the rule (xa)b = xa.b.
Applying this rule, we can rewrite the expression as xy(3x')y. Now, we can simplify the expression further by multiplying the coefficients and combining the variables. The simplified expression is 3x²yy' = 3x²y².