2. 4x²−5x−4=0

Question

\(D=(-5)^2-4\cdot4\cdot(-4)=89\).

\(x_{1,2}=\frac{5\pm\sqrt{89}}{8}\).

Ответ: \(x_1=\frac{5+\sqrt{89}}{8},\ x_2=\frac{5-\sqrt{89}}{8}\).

Accepted Answer

\(D=(-5)^2-4\cdot4\cdot(-4)=89\).

\(x_{1,2}=\frac{5\pm\sqrt{89}}{8}\).

Ответ: \(x_1=\frac{5+\sqrt{89}}{8},\ x_2=\frac{5-\sqrt{89}}{8}\).