Question

Помогите плиииз!!......

Answer 1

$y=x^2-ax-5\\\\M(2,-5):\; \; -5=2^2-a\cdot 2-5\; ;\; \; -5=-1-2a\; ;\; \; 2a=4\; ;\\\\a=2\; \; \Rightarrow \; \; y=x^2-2x-5\; ;\; \; x_{versh}=-\frac{b}{2a}=-\frac{-2}{2}=1\; ;\\\\y(1)=1-2-5=-6\\\\vershina\; \; (1,-6)\\\\Otvet:\; \; B).$