Answer:
24
Step-by-step explanation:
Given a quadratic equation in standard form, ax² + bx + c = 0 (a ≠ 0 )
Then the discriminant is
b² - 4ac
Given
2x + 5x² = 1 ( subtract 1 from both sides )
5x² + 2x - 1 = 0 ← in standard form
with a = 5, b = 2, c = - 1 , then
b² - 4ac = 2² - (4 × 5 × - 1) = 4 - (- 20) = 4 + 20 = 24
