Step-by-step explanation:
To complete the square, take half of the second coefficient, square it, then add the result to both sides.
(-8/2)² = (-4)² = 16
x² − 8x + 16 = 9 + 16
Solving:
(x − 4)² = 25
x − 4 = ±5
x = 4 ± 5
x = -1 or 9
Answer:
part 1: x^2 + -8 x=9
part 2: Add 16 to each side
part 3: (x-4)^2 =25
part 4: -1 and 9
