(6y−7)(5y+4)

To simplify this expression, we can use the distributive property.

(6y - 7)(5y + 4) = 6y(5y) + 6y(4) - 7(5y) - 7(4)
= 30y^2 + 24y - 35y - 28
= 30y^2 - 11y - 28

So, (6y - 7)(5y + 4) simplifies to 30y^2 - 11y - 28.