Answer
Please see the graph.
$x=36.88, -4.88$
Work Step by Step
$.25x^2-8x-45=0$
$x=(-b±\sqrt {b^2-4ac})/2a$
$x=(-(-8)±\sqrt {(-8)^2-4*1/4*(-45)})/2*.25$
$x=(8±\sqrt {64+45})/.5$
$x=(8±\sqrt {109})/.5$
$x=2*(8±\sqrt {109})/2*.5$
$x=2*(8±\sqrt {109})$
$x=2*(8±10.44)$
$x=2*(8+10.44)$
$x=2*(18.44)$
$x=36.88$
$x=2*(8-10.44)$
$x=2*(-2.44)$
$x=-4.88$
