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anonymous
 one year ago
If ƒ(x ) = x 2 + 1 and g(x ) = 3x + 1, find 2 · ƒ(4).
anonymous
 one year ago
If ƒ(x ) = x 2 + 1 and g(x ) = 3x + 1, find 2 · ƒ(4).

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SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0\(\large\color{purple}{ \displaystyle f(x)=x^2+1 }\) \(\large\color{brown}{ \displaystyle g(x)=3x+1 }\) To find \(2\cdot f(2)\) you don't need the \(g(x)\). Just, plug in 2 instead of x into the \(f(x)\), and then multiply the result times two.

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0Ok, if I wanted to find: \(4\cdot f(3)\) then this is what I would do: \(\large\color{black}{ \displaystyle f(x)=x^2+1 }\) Plug in 3 instead of x: \(\large\color{black}{ \displaystyle f(\color{red}{3})=\color{red}{3}^2+1 }\) I know that \(3^2=9\), so I can write that: \(\large\color{black}{ \displaystyle f(3)=9+1 }\) And then, obviously, 9+1=10, so this is what I get for \(f(3)\). \(\large\color{black}{ \displaystyle f(3)=10 }\) Now, I have to multiply: I am asked to find \(4 \cdot f(3)\), and since I know that \(f(3)=10\), I can just go ahead and apply that (substitute 10 for f(3) ): \(\large\color{black}{ \displaystyle 4\cdot f(3)=4 \cdot 10 = 40 }\)

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0(hope this is a helpful example)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i got an answer that wasnt one of the options

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0That is not possible

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0\(\large\color{black}{ \displaystyle f(x)=x^2+1 }\) \(\large\color{black}{ \displaystyle f(4)=\bf ? }\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i said i did it wrong then i redid it and got it right
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