Q. f(x)=2x3+8h(x)=312−5xWrite (f∘h)(x) as an expression in terms of x.(f∘h)(x)=
Substitute h(x) into f(x): To find the composition of the functions (f∘h)(x), we need to substitute the function h(x) into the function f(x). This means we will replace every instance of x in f(x) with h(x).
Write down h(x): First, let's write down the function h(x): h(x)=312−5x. This is the cube root of (12−5x).
Write down f(x): Now, let's write down the function f(x): f(x)=2x3+8.
Cube root of (12−5x): Substitute h(x) into f(x) to get (f@h)(x): (f@h)(x)=f(h(x))=2(h(x))3+8.
Replace cubed h(x): Now we need to cube the expression for h(x): (312−5x)3. When we cube a cube root, they cancel each other out, so we are left with the expression inside the cube root, which is 12−5x.
Simplify the expression: Replace the cubed h(x) in the expression for (f@h)(x): (f@h)(x)=2(12−5x)+8.
Multiply through the expression: Now we simplify the expression: (f@h)(x)=2×12−2×5x+8.
Combine like terms: Multiply through the expression: (f@h)(x)=24−10x+8.
Final expression: Combine like terms to get the final expression for (f@h)(x): (f@h)(x)=32−10x.
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