Answer:
a. x² - 3x - 8 = 0
Step-by-step explanation:
The quadratic formula is used to solve equations of the form
ax² + bx + c = 0
Where a, b, and c, are constants.
So, the equation with this form is
a. x² - 3x - 8 = 0
Where a = 1, b = -3 and c = -8.
Therefore, the answer is
a. x² - 3x - 8 = 0