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Sum

**Multiply:** `3-2/3 "xy"+5/7 "xy"^2-16/21 "x"^2"y"` by `− 21"x"^2"y"^2`

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#### Solution

`= 63x^2y^2+42/3x^3y^3-105/7x^3y^4+16x^4y^3`

= −63x^{2}y^{2} + 14x^{3}y^{3} − 15x^{3}y^{4} + 16x^{4}y^{3}

Concept: Multiplying a Monomial by a Polynomial

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