Find the vertex of the graph of the equation y=-2x^2+18x-15.
y=-2x^2+18x-15.
y = 2 (x^2 + 9x) - 15 'complete the squre' for x to get y = a(x-h) + k vertex form for a parabola
= 2 (x+4.5)2 - 55.5 vertex is ( - 4.5, -55.5 )
Sorry....I didn't see the ' - ' sign in front of the ' 2 '
-2 ( x^2-9x) - 15
-2(x - 4.5)2 + 40.5 - 15
-2(x-4,5)2 + 25.5 vertex is at 4.5 , 25,5
+36914 
