Question 48578
apply the quadratic formula to find the roots of the given function, and then graph the function. 
f(x) = x^2 + 4 
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (0 +- sqrt( 0-4*1*4 ))/(2*1) }}} 
{{{x = (0+- sqrt( -4 ))/(2) }}} 
X=+i....OR......-i
X..........0...............1..............2........ETC
Y..........0...............5..............8.........ETC

{{{ graph( 500, 500, -10, 100, -10, 100,x^2+4) }}}
g(x) = x^2 + x + 12
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-1 +- sqrt( 1^2-4*1*12 ))/(2*1) }}} 
{{{x = (-1 +- sqrt( 1-48 ))/(2) }}} 
{{{x = (-1 +- sqrt(47))/(2) }}}
X=-0.5+i*0.5*SQRT(47)............OR..........-0.5-i*0.5*SQRT(47) 
X..0..........1.........2.......ETC
Y..12.........14........18.ETC
{{{ graph( 500, 500, -5, 100, -5, 100,x^2+x+12) }}}