Chapter 8 - Section 8.6 - Further Graphing of Quadratic Functions - Exercise Set - Page 527: 86

$(-.36538, 5.79)$

$f(x)=-5.2x^2-3.8x+5.1$ Vertex is at $x=-b/2a$ $x=-(-3.8)/2*-5.2$ $x=3.8/-10.4$ $x=-.36538$ $f(x)=-5.2x^2-3.8x+5.1$ $f(-.36538)=-5.2*(-.36538)^2-3.8*(-.36538)+5.1$ $f(-.36538)=-5.2*(.1335)+1.388444+5.1$ $f(-.36538)=-.6942+6.488444$ $f(-.36538)=5.794244$ $f(-.36538)=5.79$