Х(х+7)=(2-х)(х+2) Решите уравнение

х(х+7)=(2-х)(х+2) x²+7x=2x+4-x²-2x x²+7x=4-x² 2x²+7x-4=0 D=49+32=81 [latex] x_{1}= \frac{-7+9}{4} = \frac{1}{2} [/latex] [latex] x_{2}= \frac{-7-9}{4} = -4[/latex]