3.1 Assignment

• infinite
• x=3
• removable
• x=-3
• no discontinuity
• N/A
• x=0

• no discontinuity
• removable discontinuity
• infinite discontinuity
• N/A
• x=-4/9

• removable
• an infinite discontinuity at x=-1
• no other discontinuities
• infinite

• (-∞, -5) U (-5, 3) U (3, ∞)
• (-∞, -7) U (-7, 15) U (15, ∞)
• (-∞, -3) U (-3, 5) U (5, ∞)
• (-∞, -15) U (-15, 7) U (7, ∞)

• ([0, 5) ∪ (5, ∞)

• (-∞, 5]
• [0,25) U (25, ∞)

• (-∞, ∞)

• (-∞, 1) U (1, 3) U (3, ∞)
• (-∞, 1]

• (-∞, 1) U (1, 3)
• (-∞, 3) U (3, ∞)