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alukav5142 [94]
2 years ago
9

I need help please with this 1 problem

Mathematics
1 answer:
Lyrx [107]2 years ago
5 0

Answer:

See below, please

Step-by-step explanation:

We know

f(x) =  {x}^{2}  + 3x - 7

g(x) = 3x + 5

h(x) = 2 {x}^{2}  - 4

Hence

f(g(x))

=  {(3x + 5)}^{2}  + 3 \times (3x + 5) - 7

= (9 {x}^{2}  + 30x + 25) + (9x + 15) - 7

= 9 {x}^{2}  + 39x + 33

h(g(x))

= 2 \times  {(3x + 5)}^{2}  - 4

2 \times (9 {x}^{2}  + 30x + 25) - 4

= 18 {x}^{2}  + 60x + 50 - 4

= 18 {x}^{2}  + 60x + 46

(h - f)(x)

= h(x) - f(x)

= (2 {x}^{2}  - 4) - ( {x}^{2}  + 3x - 7)

=  {x}^{2}  - 3x + 3

(f + g)(x)

= f(x) + g(x)

= ( {x}^{2}  + 3x - 7) + (3x + 5)

=  {x}^{2}  + 6x - 2

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