Chapter 5, Lesson 5


5-5.A understand the definition of subtraction
Which is equivalent to the expression —5x—(—7x)?
(a) —12x (b) —2x (c) 2x (d) 12x

5-5.B recognize opposites
Which are not opposites?
(a) 19, —19 (b)
(c) 4x, —4x (d) 2x4, —4x2

5-5.C add polynomials
Write each sum in standard form.
a. (y3 + 4y + 7) + (12y2 — 4y — 2)
b. (—3 + 9g + g2 + 3g3) + (10g2g — 9)