Topic Details (Notes format)

How to Perform Function Composition (f ∘ g)

Subject: Mathematics

Book: Maths Mastery

Function composition f(g(x)) means applying g first, then feeding that result into f. For instance, if f(x)=x²+1 and g(x)=2x–3, then f(g(x))= (2x–3)²+1=4x²–12x+9+1=4x²–12x+10. Composition frequently appears in advanced algebra, transformations, and chain-rule usage in calculus. In real-world models, you might first calculate a cost function g(x), then apply a tax function f to g(x). Mastery of composition fosters advanced manipulations of nested processes and underpins functional decomposition strategies in computing, engineering, or multi-stage transformations.

Practice Questions

If 5x - 2 = 13, what is the value of x?

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The ratio of two numbers is 3:5, and their sum is 64. What are the numbers?

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If x^3 - 3x^2 + 4 = 0, what is one root of the equation?

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If the radius of a circle is doubled, what happens to its area?

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What is the greatest common divisor (GCD) of 36 and 48?

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