Question

Помогите!!!!!!!!!!!!!!!!!!!!!​

Answer 1

Ответ: 1.4

$D=b^{2} -4ac=144-140=4\\\\D>0 \\\\x_{1} =\frac{-b+\sqrt{D} }{2a} =\frac{12+2}{10}=1.4 \\x_{2} =\frac{-b-\sqrt{D} }{2a} =\frac{12-2}{10}=1$

Объяснение: