Multiply: $4x^{2}y \cdot (-3xy^{3})$.

Multiply: $4x^{2}y \cdot (-3xy^{3})$.
  1. $-12x^{3}y^{4}$
  2. $12x^{3}y^{4}$
  3. $-12x^{2}y^{3}$
  4. $-7x^{3}y^{4}$

Solution

$(4)(-3) \cdot x^{2+1} \cdot y^{1+3} = -12x^{3}y^{4}$.

Asked in: IMO

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