Math
posted by Amy .
I need help with these three problems. They are on a Study Guide and I need some refreshing up of how to do them.
17. Solve the equation using the zero product property...
8n(5n+3)
19. Solve the equation by factoring
5z^22z3=0
20. Solve the equation by completing the square..
x^3x=4
Thank you.. Please show me how you did it if possible.

you find the 2 factors of 3 sum of which wiil give you 4