Without using paper and pencil, evaluate each expression given the following functions. $ƒ (x) = x + 1$ and $g (x) = x^{2}$
$open paren f with hook composed with g close paren times 2$

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Understand that the notation $(\f\circ g)(2)$ means the composition of the functions $f$ and $g$ evaluated at $x=2$. This is written as $f(g(2))$, which means you first find $g(2)$ and then plug that result into $f$.

Start by evaluating $g(2)$. Since $g(x) = x^2$, substitute $2$ for $x$ to get $g(2) = 2^2$.

Calculate \$2^2$ to find the value of $g(2)$. This gives you the input for the next step.

Next, substitute the value of $g(2)$ into the function $f(x) = x + 1$. So, you will compute $f(g(2)) = f(\text{value from previous step}) = \text{value} + 1$.

Finally, add 1 to the value obtained from $g(2)$ to complete the evaluation of $(f \circ g)(2)$.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Function Composition

Function composition involves applying one function to the result of another, denoted as (f∘g)(x) = f(g(x)). It means you first evaluate g at x, then use that output as the input for f. Understanding this process is essential to correctly evaluate composite functions.

Evaluating Functions

Evaluating a function means substituting the input value into the function's formula and simplifying. For example, if f(x) = x + 1, then f(3) = 3 + 1 = 4. This skill is necessary to find the value of functions at specific points.

Order of Operations

The order of operations dictates the sequence in which mathematical operations are performed, typically parentheses, exponents, multiplication/division, and addition/subtraction. Correctly applying this order ensures accurate evaluation of expressions like g(2) = 2^2 before applying f.

Without using paper and pencil, evaluate each expression given the following functions. ƒ(x)=x+1ƒ(x)=x+1 and g(x)=x2g(x)=x^2 (ƒ∘g)(2)(ƒ∘g)(2)