Given that x4+ax3+bx2+ax+1=0x^4 + ax^3 + bx^2 + ax + 1 = 0x4+ax3+bx2+ax+1=0 has a real root, what is the constraint on the coefficients?
a2≥4b−8a^2 \geq 4b - 8a2≥4b−8
a2≥4b+4a^2 \geq 4b + 4a2≥4b+4
a2≥4(b−2)a^2 \geq 4(b-2)a2≥4(b−2)
b2≥4a+4b^2 \geq 4a + 4b2≥4a+4