Answer:
3(z+3) = 3z + 9 if thats what your asking
Step-by-step explanation:
Check the picture below.
Multiply the equations together
(5x+4)(5x^2-7x-2)
25x^3-35x^2-10x+20x^2-28x-8
Add like terms
25x^3-15x^2-38x-8
x= 6, -7