Add or subtract the following polynomials as indicated. Note that in subtraction the sign of every term within the parentheses must be changed before corresponding elements are added.

(a) (25x – 9y) + (32x + 16y)

(b) (84x – 31y) – (76x + 43y)
Multiplying each term in the second set of parentheses by −1, which in effect changes the sign of the said terms, and then simply adding, we have

(c) (9x2 + 7x) – (3x2 – 4x)
Changing the signs of each of the terms in the second set of parentheses and then adding, we have

(d) (42x2 + 23x) – (5x2 + 11x – 82)

Transcribed Image Text:

(25x9y)+(32x + 16y) = 57x + 7y