Answer:
a = 5
Step-by-step explanation:
For the quadratic equation
ax² + bx + c = 0,
the discriminant is
b² - 4ac
Here we have ax² - x - 3, so we have
a = a
b = -1
c = -3
b² - 4ac = 61
(-1)² - 4(a)(-3) = 61
1 + 12a = 61
12a = 60
