Answer:
c > 5.28
Step-by-step explanation:
From the quadratic formula when the quantity under the square root sign, known as the determinant, is positive there will be two real solutions
b² - 4ac > 0
(-13)² - 4(8)c > 0
169 - 32c > 0
-32c > -169
c > 5.28125
Rounded
c > 5.28