Question 859184
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
 P(x)=-2x^2+7x+8
     = -2(x - 7/4)^2 + 49/8 + 64/8
    0 = -2(x - 7/4)^2 + 113/8
   113/16 = (x-7/4)^2
   7/4 ± sqrt(113)/4 = x
   1.75 ± 2.6575 = x
{{{drawing(300,300,   -10,10,-10,40, 
 grid(1),
circle(7/4, 14.125,0.4),
graph( 300, 300, -10,10,-10,40,0,-2x^2+7x+8))}}}