Partial fractions

Partial fractions of 1 / (x (x + 1)) are:

• 1 1/x - 1/(x + 1)
• 2 2/x
• 3 x - (x + 1)
• 4 1/x + 1/(x + 1)

A fraction is proper when the degree of the numerator is:

• 1 Zero always
• 2 Equal to the denominator's
• 3 Less than the degree of the denominator
• 4 Greater than the denominator's

(x + 3) / ((x + 1)(x + 2)) = A/(x + 1) + B/(x + 2). What is A?

• 1 3
• 2 2
• 3 -1
• 4 1

(x + 3) / ((x + 1)(x + 2)) = A/(x + 1) + B/(x + 2). What is B?

• 1 -1
• 2 2
• 3 1
• 4 -2