Answer:
Answer (4)
Step-by-step explanation:
2x^2 - x - 10 = 0
x^2 - 1/2*x - 5 = 0
x = 1/4 ± √(1/16 + 80/16) = 1/4 ± √(81/16) = 1/4 ± 9/4
x1 = -8/4 = -2 or x2 = 10/4 = 2.5
