If x2−2ax+a+2=0x^2 - 2ax + a + 2 = 0x2−2ax+a+2=0 has no real roots, what is the range of aaa?
−1<a<2-1 < a < 2−1<a<2
a<−1a < -1a<−1 or a>2a > 2a>2
1<a<21 < a < 21<a<2
a<1a < 1a<1