5. (d-4) (d + 4) = d² - [4d (d+9)]
II. Solving Quadratic Equation by using
COMPLETING THE SQUARE
1. m²-6m - 16 = 0
2. x² -10x - 24 = 0
3. f²=20f + 69
4. c² +9c=0
5. h² - 7h = 0​