Answer:
-14x⁴y³ -21x³y² + 28x²y²
Solution:
-7xy(2x³y²+3x²y-4xy)
= -7xy × 2x²y³ - 7xy × 3x²y -7xy × (- 4xy)
= -14x⁴y³ - 7xy × 3x²y -7xy × (- 4xy)
= - 14x⁴y³ - 21x³y² + 7xy × 4xy
= - 14x⁴y³ - 21x³y² + 28x²y²
