Question

x^2-1/2-11x=11
Помогите

Answer 1

$\frac{x^2 -1 -2 \cdot 11x}{2}-11=0 \\ \\ \frac{x^2 -1 -22x-2 \cdot 11}{2}=0 \\ \\ \frac{x^2 -1 -22x-22}{2}=0 \\ \\ x^2 -22x-23=0; \ \ x_{1,2} =\frac{22 \pm \sqrt{22^2 -4 \cdot 1 \cdot (-23)}}{2 \cdot 1}= \frac{22 \pm \sqrt{484 +92 }}{2}= \frac{22 \pm 24}{2}; \\ \\ x_1 = 23, \ \ x_2=-1$