Question

14х во второй степени+25х-84=0

Answer 1

$14x^2+25x-84=0 \\ D=625-4*14*(-84)=625+4704=5329 \\ \\ x_{1}= \frac{-25+73}{28} = \frac{48}{28} = \frac{12}{7}=1 \frac{5}{7} \\ \\ x_{2}= \frac{-25-73}{28} = \frac{-98}{28} =- \frac{7}{2} =-3,5$

Ответ: $1 \frac{5}{7} ;-3,5$