Решите уравнение: -7х2-20х+32=0

[latex] -7x^{2} -20x+32=0[/latex] [latex]D= b^{2} -4ac[/latex] D=400+896=1296 [latex] x=\frac{-b +-\sqrt{d}}{2a} [/latex] [latex]x= \frac{20+-36}{-14} [/latex] [latex] x_{1} =-4[/latex] [latex] x_{2} =\frac{16}{14} = \frac{8}{7} [/latex] Ответ: [latex](-4; \frac{8}{7})[/latex]