Answer
$(x + 7y)$$(3x - 5y)$ = $3x^{2} + 16xy - 35y^{2}$
Work Step by Step
$(x + 7y)$$(3x - 5y)$ = $3x^{2}$ - $5xy$ + $21xy$ - $35y^{2}$
= $3x^{2} + 16xy - 35y^{2}$
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