quadratic formula in stock market x = − b ± b 2 − 4 a c 2 a x equals the fraction with numerator negative b plus or minus the square root of b squared minus 4 a c end-root and denominator 2 a end-fraction 𝑥 = − 𝑏 ± 𝑏 2 − 4 𝑎 𝑐 √ 2 𝑎 y = a x 2 + b x + c y equals a x squared plus b x plus c 𝑦 = 𝑎 𝑥 2 + 𝑏 𝑥 + 𝑐