Help your students prepare for their Maths GCSE with this free composite and inverse functions worksheet of 35 questions and answers
Inverse functions are a way of reversing an original function.
The inverse of a function can be found for simple linear functions by using function machines. We can do this by finding the inverse operation for each stage in the function machine. It is important to have a strong understanding of inverse operations, for example the inverse of add 3 is subtract 3 and the inverse of square is square root. Care must be taken with the order of operations.
As functions become more complex, for example quadratic functions or when x is the denominator of an algebraic fraction, a more sophisticated method is required. This involves writing the original function as an equation in x and y, interchanging the variables and rearranging the equation to make y the subject.
This topic also covers composite functions. This is when two or more functions are applied in succession. Composite functions can be evaluated by substituting a value into the inner function, and then the answer is substituted into the outer function. Care must be taken to apply the functions in the correct order.
Inverse functions and composite functions can also be used to form and solve algebraic equations.
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