Answer:
z = -1
Step-by-step explanation:
Solve for z:
4 z^2 + 8 z + 4 = 0
Divide both sides by 4:
z^2 + 2 z + 1 = 0
Write the left hand side as a square:
(z + 1)^2 = 0
Take the square root of both sides:
z + 1 = 0
Subtract 1 from both sides:
Answer: z = -1
