Quadratic equation calculator

Quadratic equation has the basic form:

a x^{2} + b x + c = 0

Enter the quadratic equation's coefficients a, b, and c of its basic standardized form. A solution of quadratic equations is usually two different real or complex roots or one double root — the calculation using the discriminant.

Calculation:

n * (n - 1) / 2 = 120 0.5 n^{2} - 0.5 n - 120 = 0 a = 0.5; b = - 0.5; c = - 120 D = b^{2} - 4 a c = 0 . 5^{2} - 4 \cdot 0.5 \cdot (- 120) = 240.25 D > 0 n_{1, 2} = \frac{- b \pm D}{2 a} = \frac{0 . 5 \pm 2 4 0 . 2 5}{1} n_{1, 2} = 0.5 \pm 15.5 n_{1} = 16 n_{2} = - 15 Factored form of the equation: 0.5 (n - 16) (n + 15) = 0

Solution in text:

0.5n²-0.5n-120=0 ... quadratic equation

Discriminant:
D = b² - 4ac = 240.25
D > 0 ... The equation has two distinct real roots

n₁ = 16
n₂ = -15

P = {16; -15}