Answer:
20x^2 +19xy+3y^2
Step-by-step explanation:
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20x² +19xy +3y²
Use the distributive property.
(4x +3y)(5x +y)
= 4x(5x +y) +3y(5x +y)
= 20x² +4xy +15xy +3y²
Collect terms.
= 20x² +19xy +3y²
