+892 Find the vertex of the graph of the equation y = -2x^2 + 8x - 15 - 3x^2 - 14x + 25.
+120 1. first we simplfy
y = -5x^2 -6x + 10 is the most simplfied version
* We can now convert this to vertex form
y= -5 ( x^2 + 6/5 x - 2 )
==> y = -5 ( x + 3/5)^2 +59/5 is the vertex form
vertex ==> (h,k) and the standard vertex form == > y = a ( x − h ) 2 + k
thus vertex ==> (-3/5 , 59/5)
