Q5) Given - Let f(x) = 9x²-49 9(x) = 3x - 7 To find = a) (fog)(x) b) (gof) (x) :-) (x)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.5: Graphs Of Functions
Problem 58E
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Q5) Given let f(x) = gx²-49
9(x) = 3x - 7
To find = a) (fog) (H)
b) (gof) (x)
e) (fox)
Solution = a) (fog)(x) = f(g(x))
[ (fog)(x)
L
b) (gof) (x) =
=
(gof)(x)
£)(x)
2 (fog) (H) = 81x² = 378x +329
-
=
=
=
=
n
= 9 (3x-7)² - 49 - since f(x)=9x²=49
- 9 [92²-42x+49] -49
2
81x²-376x +378 -49
= f[3x-7] - since g(x)=38-7
g(f(x))
9 (9x²-49)
3 (9x²-49) -7 - since g(x)=32-7
2
97x²-147 - 7
2
974²-154
f(x)
9(x)
9x²-49
31-7
( ) ( x ) = 3x+7
2
11
(3-7) (3x+7) [since a²_b² = (a+b)(a+b)]
(3x-7)
IT
Transcribed Image Text:2 Q5) Given let f(x) = gx²-49 9(x) = 3x - 7 To find = a) (fog) (H) b) (gof) (x) e) (fox) Solution = a) (fog)(x) = f(g(x)) [ (fog)(x) L b) (gof) (x) = = (gof)(x) £)(x) 2 (fog) (H) = 81x² = 378x +329 - = = = = n = 9 (3x-7)² - 49 - since f(x)=9x²=49 - 9 [92²-42x+49] -49 2 81x²-376x +378 -49 = f[3x-7] - since g(x)=38-7 g(f(x)) 9 (9x²-49) 3 (9x²-49) -7 - since g(x)=32-7 2 97x²-147 - 7 2 974²-154 f(x) 9(x) 9x²-49 31-7 ( ) ( x ) = 3x+7 2 11 (3-7) (3x+7) [since a²_b² = (a+b)(a+b)] (3x-7) IT
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