Answer:
1. x² + 9x - 20 = 0
a = 1, b = 9, c = -20
2. 2x² + 6 - 2x = 0
2x² - 2x + 6 = 0
a = 2, b = -2, c = 6
3. x² + 12x + 36 = 12x
x² + x + 36 = 0
a = 1, b = 1, c = 36
4. 25x² - 20x + 20x - 16 = 0
25x² + x - 16 = 0
a = 25, b = 1, c = -16
5. 3x² + 6x - 8x - 16 = 2x²
3x² - 2x² - 2x - 16 = 0
x² - 2x - 16 = 0
a = 1, b = -2, c = -16
