If x2+ax+1>0x^2 + ax + 1 > 0x2+ax+1>0 for all real xxx, which is true for aaa?
∣a∣<2|a| < 2∣a∣<2
∣a∣>2|a| > 2∣a∣>2
a<−2a < -2a<−2
a>2a > 2a>2