If x2+ax+a+3>0x^2 + ax + a + 3 > 0x2+ax+a+3>0 for all xxx, what is the range of aaa?
−2<a<6-2 < a < 6−2<a<6
−6<a<2-6 < a < 2−6<a<2
a<−2a < -2a<−2 or a>6a > 6a>6
a<−6a < -6a<−6 or a>2a > 2a>2