Answer Key 219
- xy
()xy+
=
()()
()
2
(^22) y
2
2 2
+(−
92 −(−
= ()
9 −()(−
2
2 2
−
49
81 4
=^49
77
7
11
- (y + z)−3 = ((−2)+(−3))−3
= (−2 − 3)−3
= (−5)−3
=^13
()− 5
=
1
− 125
=−
1
125
- Abbhh= ⋅⋅
1
2
1
2
1284 = 8
- Vrrhh= ()()()=
1
3
1
3
(^2) h ())(( 471
1
π )(
- c^2 = a^2 + b^2
c^2 = 8^2 + 15^2
c^2 = 64 + 225
c^2 = 289
c is 17 or −17 - −− +
⎛
⎝⎜
⎛⎛
⎝⎝
⎞
⎠⎟
⎞⎞
⎠⎠=−
1
2
73 − 0
1
2
32 3330 ⎞⎞⎞ 73 + 0
(^123)
xy^3 xy xy^37 xy
- (8a^3 + 64 b^3 ) = 8 a^3 + 64 b^3
- −4 − (−2y^3 ) = −4 + 2 y^3
- −3(x + 4) = −3x − 12
- 12 + (x^2 + y) = 12 + x^2 + y