Question 875255
y = ax^2 + bx + c
y= -2x^2-8x+5 = -2(x+ {{{highlight_green(2)}}})^2 + {{{highlight_red(8)}}} + 5
 y =  -2(x+2)^2 +13, V(-2,13) Opening Downward a<0, V(-2,13) max point
+{{{highlight_green(2)= b/2a = (-8)/2(-2) }}} 
+{{{highlight_red(8)}}} = -a(2)^2 = -(-2)(4) = 8