Question 829512
{{{x^2+4x<12}}}
{{{x^2+4x-12<0}}}
{{{(x+6)(x-2)<0}}}
The function crosses the x axis at x=-6 and x=2.
You can easily pick out the region when the function is less than zero. 
{{{ graph( 300, 300, -12, 12, -12, 12, x^2+4x-12) }}}