12. 5x² − 2x − 7 = 0

Question

Дискриминант: \(D=(-2)²-4\cdot5\cdot(-7)=144\), \(\sqrt{D}=12\).

\(x=\frac{2\pm12}{10}\).

Ответ: x₁ = 7/5, x₂ = −1.

Accepted Answer

Дискриминант: \(D=(-2)²-4\cdot5\cdot(-7)=144\), \(\sqrt{D}=12\).

\(x=\frac{2\pm12}{10}\).

Ответ: x₁ = 7/5, x₂ = −1.