
Mark M. answered 04/23/20
Mathematics Teacher - NCLB Highly Qualified
x2 - 3x ≥ 4
x2 - 3x - 4 ≥ 0
(x - 4)(x + 1) ≥ 0
{-1, 4} for the = part
For the > part, both factors must be either positive or negative.
Both positive x > 4
Both negative x < -1
Closed dot on 4 and line to the right.
Closed dot on -1 and line to the left.