Chapter 9 Radical Functions
Chapter 9 Radical Functions
Chapter 9 Radical Functions
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SSM: Intermediate Algebra<br />
<strong>Chapter</strong> 9 Review Exercises<br />
42.<br />
x + 2 + x + 9 = 7<br />
x + 2 = 7 − x + 9<br />
( x + 2) = ( 7 − x + 9)<br />
2 2<br />
x + 2 = 49 − 14 x + 9 + x + 9<br />
14 x + 9 = 56<br />
x + 9 = 4<br />
( ) 2 2<br />
x + 9 = 4<br />
Check x = 7<br />
x + 9 = 16<br />
( ) ( )<br />
x = 7<br />
7 + 2 + 7 + 9 = 7<br />
7 = 7 true<br />
The solution is 7.<br />
43. y = − 2<br />
x y<br />
0 0<br />
1 −2<br />
4 −4<br />
9 −6<br />
16 −8<br />
y<br />
x<br />
?<br />
45. y = − x − 5 + 3<br />
x y<br />
5 3<br />
6 2<br />
9 1<br />
14 0<br />
21 −1<br />
4<br />
y<br />
−4<br />
46. y = 2 x + 4 − 1<br />
x y<br />
−4 −1<br />
−3 1<br />
0 3<br />
5 5<br />
12 7<br />
y<br />
4<br />
8<br />
1 6<br />
x<br />
4<br />
8<br />
x<br />
−2<br />
2<br />
x<br />
−4<br />
−4<br />
−8<br />
44. y = 3 x + 1<br />
x y<br />
0 1<br />
1 4<br />
4 7<br />
9 10<br />
16 13<br />
8<br />
4<br />
y<br />
47. f ( x) = 4x − 7 − 2x<br />
+ 1<br />
4x<br />
− 7 − 2x<br />
+ 1 = 0<br />
Check x = 4<br />
4x<br />
− 7 = 2x<br />
+ 1<br />
( 4x<br />
− 7) = ( 2x<br />
+ 1)<br />
2 2<br />
4x<br />
− 7 = 2x<br />
+ 1<br />
2x<br />
= 8<br />
( ) ( )<br />
x = 4<br />
4 4 − 7 − 2 4 + 1 = 0<br />
?<br />
0 = 0 true<br />
4 8<br />
x<br />
305
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