# F(x) = 4x - 1; g(x) = 5x ( to the second power). which expression is equal to (f o g)(x)? a. 20x ( to the second power) - 1 b. 20x ( to the third power) - 5x ( to the second power) c. 5x ( to the second power) + 4x - 1 d. 80x ( to the second power) -40x + 5

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## 4 Answers

0 votes
by (560 points)

For this case we have that by definition, if we want to find (f o g) (x) we must replace g (x) in f (x), on the contrary, if we want to find (g o f) (x) we must replace f (x) in the function g (x).

So:

Thus, the expression that is equal to (f o g) (x) is, or 20x (to the second power) - 1

Option A

20x (to the second power) - 1

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by (700 points)

(f o g)(x)=

stick g(x) in for x in the function f(x)

(f o g)(x)= 4(g(x)) -1

=4*5x^2 -1

= 20x^2 -1

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by (59.5m points)
I believe it is 60-10=x because it says she purchased it with 60\$ but recieved 10\$ in change causing the amount we dont know to be a variable such as "x"
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by (59.5m points)

its 60-10+x why, because she bought the dress with \$60 and she received \$10 dollars back. We don't know the variable.

Step-by-step explanation: