Question

Help me please it’s urgent

Answer 1

`\bold{\text{Answer:}\quad (4(y-4z))/(3y(y+5z))}`

Explanation:

`.\quad (12y+8yz)/(y^4+9y^3z+20y^2z^2)\cdot (y^2-16z^2)/(6z+9)\\\\\\=(4y(3+2z))/(y^2(y+4z)(y+5z))\cdot ((y-4z)(y+4z))/(3(2z+3))\\\\\\=\large\boxed{(4(y-4z))/(3y(y+5z))}`