Question 623723
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,  ·
f(x)=5x^2 + 25x-55    | parabola opening Upward 5>0 with min at x = -2.5
f(-2.5) = -345/4   Yes!  y &#8805;  -86.25
 f(x) = 15 is an horizontal line, domain can be any real number
{{{drawing(300,300,   -6, 6, -100, 20,  blue(line(2,6,2,-6))  , grid(1),

graph( 300, 300, -6, 6, -100, 20,0,15, 5x^2 + 25x-55))}}}