1. (x+6)= 15
a. - 12a + 21 = 0
bi x + 12x - 21 = 0
c. x² + 12x + 21 = 0
d. x2 - 12x - 21 = 0
2. (2x + 3)2 + (x + 4) = 10
a. 2.1 +24x - 12 = 0
6. 5x7 - 20x - 15 = 0
c. 5x2 + 20x + 15 = 0
d. -5x+ + 18x + 15 = 0
2
a. 3x - 14x + 4 = 0
b. 37+14x + 4 = 0
c. 3x2 + 14x - 4 = 0
d. 3x2 - 14x - 4 = 0​