Odpowiedź:
2x² - 3x - 5 = 0
a = 2 , b = - 3 , c = - 5
Δ = b² - 4ac = (- 3)² - 4 * 2 * (- 5) = 9 + 40 = 49
√Δ = √49 = 7
x₁ = ( - b - √Δ)/2a = ( 3 - 7)/4 = - 4/4 = - 1
x₂ = (- b + √Δ)/2a = (3 + 7)/4 = 10/4 = 2 2/4 = 2 1/2
