2(y-4)(y+4)-(y-3)
Expanding the terms inside the brackets:
= 2(y^2 - 16) - (y-3)
= 2y^2 - 32 - y + 3
= 2y^2 - y - 29

So, 2(y-4)(y+4)-(y-3) simplifies to 2y^2 - y - 29.