Find the vertex of the graph of the equation y = -2x^2 + 8x - 15 - 3x^2 - 14x + 25.
\(y=-5x^2-6x+10 <=> y'=-10x-6, y'=0 <=> x=-0.6\)
\(y= -5(-0.6)^2-6(-0.6)+10=11.8\)
so \((x,y)=(-0.6,11.8)\)
+1839 
+51 
