Question

X2 + 3x - 4 = 0 Find the value of the discriminant. A) 5 B) 6 C) 10 D) 25

Answer 1

D

Explanation:

given a quadratic equation in standard form

ax² + bx + c = 0, then the discriminant is

Δ = b² - 4ac

x² + 3x - 4 = 0 ← is in standard form

with a = 1, b = 3, c = - 4

b² - 4ac = 3² - (4 × 1 × - 4) = 9 - (- 16) = 9 + 16 = 25 → D