Key - JMap

ID: A
175 ANS:
± 3 2 , − 1 2 . 8x 3 + 4x 2 − 18x − 9 = 0
4x 2 (2x + 1) − 9(2x + 1) = 0
(4x 2 − 9)(2x + 1) = 0
4x 2 − 9 = 0 or 2x + 1 = 0
(2x + 3)(2x − 3) = 0 x = − 1 2
x = ± 3 2
PTS: 4 REF: fall0937a2 STA: A2.A.26 TOP: Solving Polynomial Equations
176 ANS: 4 PTS: 2 REF: 061112a2 STA: A2.A.39
TOP: Domain and Range
KEY: real domain
177 ANS:
−3,− 5,− 8,− 12
PTS: 2 REF: fall0934a2 STA: A2.A.33 TOP: Recursive Sequences
178 ANS: 3 PTS: 2 REF: fall0923a2 STA: A2.A.39
TOP: Domain and Range
KEY: real domain
179 ANS: 1
n 3 4 5 Σ
−r 2 + r −3 2 + 3 = −6 −4 2 + 4 = −12−5 2 + 5 = −20 −38
PTS: 2 REF: 061118a2 STA: A2.N.10 TOP: Sigma Notation
KEY: basic
180 ANS: 3 PTS: 2 REF: fall0910a2 STA: A2.A.76
TOP: Angle Sum and Difference Identities
KEY: simplifying
181 ANS:
3 ± 7. 2x 2 − 12x + 4 = 0
x 2 − 6x + 2 = 0
x 2 − 6x = −2
x 2 − 6x + 9 = −2 + 9
(x − 3) 2 = 7
x − 3 = ± 7
x = 3 ± 7
PTS: 4 REF: fall0936a2 STA: A2.A.24 TOP: Completing the Square
25