Business Calculus
[−2,∞)\(\left\[\lbrack\)-2,\(\infty\]\right\))
(−∞,−2]\(\left\)(-\(\infty\),-2\(\right\]\rbrack\)
(−∞,2]\(\left\)(-\(\infty\),2\(\right\]\rbrack\)
[2,∞)\(\left\[\lbrack\)2,\(\infty\]\right\))