Answer:
- 32
Step-by-step explanation:
Given a quadratic equation in standard form, ax² + bx + c = 0 ( a ≠ 0 ), then
the discriminant is
Δ = b² - 4ac
- x² + 2x - 9 = 0 ← is in standard form
with a = - 1, b = 2, c = - 9 , so
b² - 4ac
= 2² - (4 × - 1 × - 9)
= 4 - (36)
= - 32
