Answer?

Solve for x:
-5 x (-4-x) = 0

Divide both sides by -5:
x (-4-x) = 0

Split into two equations:
-4-x = 0 or x = 0

Multiply both sides by -1:
x+4 = 0 or x = 0

Subtract 4 from both sides:
Answer: | x = -4                or x = 0