Answer:
9
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 + 5x + 4 = 0 ← is in standard form
with a = 1, b = 5 , c = 4 , then
b² - 4ac = 5² - (4 × 1 × 4) = 25 - 16 = 9
