Expanding the given expression using the distributive property, we get:
(3y^4 + 5)(5y^7 + 4)
= 3y^4 * 5y^7 + 3y^4 * 4 + 5 * 5y^7 + 5 * 4
= 15y^11 + 12y^4 + 25y^7 + 20
Therefore, (3y^4 + 5)(5y^7 + 4) simplifies to 15y^11 + 25y^7 + 12y^4 + 20.
(3y4+5)(5y7+4)
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