Find the vertex of the graph of the equation y = -2x^2 + 8x - 15 - 3x^2 - 14x + 25.
Simplify as
-5x^2 - 6x + 10
We have th form ax^2 + bx + c
The x coordiante of the vertex = -(b) / (2a) = - (-6) / (2 * -5 ) = 6 / -10 = -,6
The y coordinate is -5(-.6)^2 - 6(-.6) + 10 = 11.8
+713 
