Question

Solve the equation. q(q+4)=0

Answer 1

Since it's already factored, use rthe zero product rule:
q = 0 or q +4 = 0
Now solve the second equation.

Answer 2

for q(q+4) equal to 0 any one of the factors must be zero
either q must be equal to 0
q=0
or (q+4) must be equal to 0
q+4=0 q=-4

Answer 3

i dont get this